Back in the day when I were a lad, we were always taking cogs off and swapping ratios. Individual rings were freely available. You just bought a free hub body and put your chosen rings on.
Flat course had one set of ratios, hilly courses had different. Now you have to buy the complete assembly, albeit with a greater choice.
So yes, it always was easy to do. Whether your suggested alterations are sensible I'll leave others to comment on.
Posts
Personally I doubt it would work as they are all a very specific shape with grooves to make them fit a freehub
All I know is that dismantling them can be problematic but not sure if this includes changing the ratios
in any case, you can buy a 7 speed 11 -34 freewheel for about a tenner on line. nice and new, unworn,
I'd still be tempted to do the franken freewheel just to see, and if you do would you post pics?
there is info from Sheldon here, https://www.sheldonbrown.com/mega7/
Flat course had one set of ratios, hilly courses had different. Now you have to buy the complete assembly, albeit with a greater choice.
So yes, it always was easy to do. Whether your suggested alterations are sensible I'll leave others to comment on.