The big issue with stainless frets is the time it takes to level, re-profile and polish them. I've done it once, and will never use them again. It took be around an hour per fret, as opposed to an hour for a complete neck with standard frets. With the general quality of the fret installation on the necks being a bit hit and miss, it's something you'd almost certainly need to do.

If you wanted to get a neck that was already perfectly set up from the factory, you'd be looking at a very expensive neck indeed. If you just had the frets fitted at the factory and did all the rest of the work yourself, then I'm sure that would be possible, though it will involve a lot of work - not much less than doing a full re-fret yourself.