frankly, its easier to add a new motor if you want those sats , not easy to use a fixed dish and multiple lnb setup with a diseqc switch to access all of them from one single dish, and the costs probably outweigh the benefits

I have an 80cm triax setup that gets me 28e + 19e + 13e with an extra feed from a separate zone 2 sly dish pointed at 30w , meaning 4 sats on a 4 way diseqc switch from 2 dishes, which is great when hopping about on those , but 23.5e would probably need another dish and possibly another for 1w , so several dishes and lnb racks etc too

you should get a dark motor like umgum (see his thread) , mine is the superior I think, and I have to fit a supreme (the one with the lcd) at my lads when the weather improves , because he has similar requirements as you do

so personally I would fit a dark motor and a dual or quad or octo lnb, as required