I say keep looking for a boat until you find one with a wheel that you like. I have sailed tiller boats for 30 years, but I like a wheel for a cruising/day sailor much better. Racing is different, but it does sound like you would be happier with a wheel, as I am.
Retrofitting has its own set of problems and I think one is better off leaving the boat steering system as installed at the factory for numerous reasons. One would certainly be how to attach below deck blocks for cables in a secure and efficient fashion.
Comments made re weather helm are good ones and a wheel only masks a problem that should be addressed as others have stated.