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Thanks for this. Confirms my gut feeling of "it should work" with some actual numbers that make sense.
I think I've got a 32 cassette somewhere in the parts bin so this should do me to begin with. Sounds like ill struggle to get to 36 without a different mech, so i'll just have to let the thighs do the talking.
Scrabble
It depends on your bike. Moving the mech down 1.6cm will get you ~4 extra teeth. So if you think it's already maxed out on a 28 you should be safe to go up to 32 with the roadlink. If you think it could clear a 32 then you can go up to a 36 with a roadlink. I don't know the dimensions of a roadlink but if it's more than 1.6cm between the centres of the bolts you get more teeth.
You don't need to worry about wrap with 1×, your mech can already wrap anything up to (50-34) + (28-11) which means an 11-44 in a 1× system.
If you can borrow a couple of cassettes and buy/borrow a roadlink that's the best way to find out.