0-100 by end of May?

So, on an impulse, I signed up to do a 100 mile ride at the end of May, for Charity (I'm nearly 54, typical MAMIL, full time job).
I've done 100 before, that's not a problem. The issue is, following a dislocated shoulder last summer, which wrecked all my summer plans, and then a winter of poor health (culminating in six weeks off the bike before new year), I literally haven't ridden at all for two months, piling on weight in the meantime.
If it were only for me, I wouldn't be so bothered, but I need to make sure I put in a good performance for the charity, as I'll be sponsored, and as I still haven't been on the bike this year (recurrence of a chest infection), I'm concerned I won't be fit in time.
I need to make a decision if I'm going to pull out, so they can find a replacement.
Thoughts?
I've done 100 before, that's not a problem. The issue is, following a dislocated shoulder last summer, which wrecked all my summer plans, and then a winter of poor health (culminating in six weeks off the bike before new year), I literally haven't ridden at all for two months, piling on weight in the meantime.
If it were only for me, I wouldn't be so bothered, but I need to make sure I put in a good performance for the charity, as I'll be sponsored, and as I still haven't been on the bike this year (recurrence of a chest infection), I'm concerned I won't be fit in time.
I need to make a decision if I'm going to pull out, so they can find a replacement.
Thoughts?
It's just a hill. Get over it.
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Having said that, I spontaneously bought some of those cheap train tickets available in May '22 and did ~80 miles around the hills near Longleat Centerparcs over ~7 hours, albeit I was in quite good shape from lots of sub 20min z5 Zwift sprint races from Jan to April.
But everyone's different.
Got a turbo trainer to conservatively build up saddle time?
2020 Voodoo Marasa
2017 Cube Attain GTC Pro Disc 2016
2016 Voodoo Wazoo
Once I was pain free I was doing more structured intervals on the turbo and on my short road rides.
The sportive was the target /goal I needed to get fit again. I also was doing an upper body weight training programme when I couldn’t walk with the air boot.
I suspect I will doing the same again this year as I’m have hip surgery later this month.
@webboo: crumbs, I thought I was bad! Best wishes for a speedy recovery
It's just a hill. Get over it.
Stop piling on the weight if you want to make it at all fun though.
It's just a hill. Get over it.
As above, try and keep the weight down though and get back into good habits, even if it is just until May!
Marin Nail Trail
Cotic Solaris
It's just a hill. Get over it.
Key is to get over your chest infection first, then you'll be fine I'm sure.
We don’t usually regret things we’ve done, only the things we didn’t do.
Forget the ‘decent performance’ refocus on the important thing, taking part and enjoying the day. Times don’t matter except on strava and then someone’s always quicker .
Desmond Tutu
Bu99er.
It's just a hill. Get over it.