Training for hills but no hills nearby

I live in the middle east in a location where there is no hills. Almost totally flat. The combination of working hours and weather makes summer riding almost impossible. Winter riding (Nov - March) is feasible but traffic conditions are not conducive to safe riding.
I am hoping to join friends in June or September for a cycle trip in Europe. Spain or French Alps. We had these trips for the last 6 years so I know what the climbs are likely to be.
The move from the UK to the ME has taken its toll on my fitness but I am now getting better organised. I have my turbo (ERG Smart) and a road bike with me and I have a trainer road account. Previously I have managed a reasonably sustained programme of TR sessions but have never managed to stay on the turbo beyond 60 mins with 45mins being preferred.
I have easy, unlimited and free access to a gym with loose weights and several multi-gym machines which allow all muscle groups to be worked. There is also a cross trainer, treadmills and a couple of bikes. Typically the bikes are pretty censored .
I also have an off road bike and access to a reasonable amount of flat but rough and sandy ground (man made desert basically).
I am happy with TR but would willingly change to another platform if it is likely to be better for my circumstances.
Given all of the above and assuming I can keep my motivation levels reasonably high is it possible to get fit for alp style climbs and longish days using limited road rides and a turbo?
I am hoping to join friends in June or September for a cycle trip in Europe. Spain or French Alps. We had these trips for the last 6 years so I know what the climbs are likely to be.
The move from the UK to the ME has taken its toll on my fitness but I am now getting better organised. I have my turbo (ERG Smart) and a road bike with me and I have a trainer road account. Previously I have managed a reasonably sustained programme of TR sessions but have never managed to stay on the turbo beyond 60 mins with 45mins being preferred.
I have easy, unlimited and free access to a gym with loose weights and several multi-gym machines which allow all muscle groups to be worked. There is also a cross trainer, treadmills and a couple of bikes. Typically the bikes are pretty censored .
I also have an off road bike and access to a reasonable amount of flat but rough and sandy ground (man made desert basically).
I am happy with TR but would willingly change to another platform if it is likely to be better for my circumstances.
Given all of the above and assuming I can keep my motivation levels reasonably high is it possible to get fit for alp style climbs and longish days using limited road rides and a turbo?
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So it's difficult to say one way or the other. But long sessions at sweetspot or threshold will help, as will improving your w/kg (specifically the kg), if there is any weight to lose.
And i'd focus on increasing your watts per kg. So if you're a chunky munky - reduce that and the figure goes up.
The TR "Climbing Road Race" speciality plan is perfect for this, their description:
As you might expect, the Climbing Road Race blocks address this diversity with a heavier emphasis on sustained power than short power, with due attention still paid to maintaining your base of aerobic endurance.
So if your races involve selective climbs, if you have to be able to hold high percentages of your FTP after hours of already challenging ride time, and if you want road-race fitness that favors longer, sustained efforts, the Climbing Road Race blocks are ideal for you.
The Century plan is also probably quite good.
As you probably know already, their plans are structured Base>Build>Speciality. You have enough time that you could work through the Sweetspot Base plan (2x 6 weeks), then Sustained Build (8 week block) and Climbing Road Race or possibly the Century plan (both 8 week blocks), which is a total of 20 weeks. You can then either go back to the start or you could repeat one of the build>speciality blocks, which could take you up to your event.
What that won't really necessarily help with is that some of the different muscles you use but you can cover that off with some core work tbh.
Also keep practising getting out of the saddle for the same periods you would do going to the Alps.
Apologies if this is all too obvious - I find the turbo efforts focused on short power stuff which is helpful but only to a point.
Dirty - Forme Calver CX Sport
Quickie - Scott CR1 SL HMX
Notable ex's - Kinesis Crosslight, Specialized Tricross
Todays I climbed 5,600 ft in 30 miles on there and they feel like proper hills to whilst you are doing them.
Cannondale Synapse alloy with 'guards for the winter roads
Fuji Altamira 2.7 for the summer roads
Trek 830 Mountain Track frame turned into a gravel bike - for anywhere & everywhere