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@BrickMan
this hub could be OK. it has splines like a modern cassette hub but instead of a lockring, it uses the smallest gear as a lockring (the cassette body is threaded).
So in theory you could unscrew the unwanted gears, and then just fit one of the gears (teh one you want) and fill the rest of the space with washers (cheap) and a nut on the end to secure.
If the wheel is like £5-10 it might be OK.
27" wheels are the biggest, then 700c (28"), then 650c (26") etc etc. With 700c/28" wheels on a 27" frame you will then probably need new brakes etc.
27" tyres are not hard to get hold of, most of the Netherlands & Denmark still roll on 27" so you can get cheap city tyres (£5 each) from bike shops quite easily. Upmarket tyres you only have Continenal Ultra & Gatorskin to choose from, which are OK.