Silent piano is not a "hot" topic on PW forum, probably due to the limited number of people using such solution. I've been strugling to get some advice too
. In terms of any technical support with software pianos and e.g. Kawai ATX system, the Digital Piano Forum is definitely a better place to aswer your question (there are a few users having silent systems and many users are experienced with software pianos).
Anyway, I use the Bechstein Vario system with the Ivory2 and Galaxy Vintage D without any problems, just plug-and-play. The adjustments I have made were related mainly to the velocity curve and reverb settings but it is just a matter of personal preferences. On the daily basis, I use internal Vario sounds with modified velocity curve to match my acoustic piano's touch.
Ivory or Galaxy products have much better sound than any other digital pianos on-board ones, no doubt about it.
Personally, I think that the silent piano is a good solution esp. when I read endless discussions (unfortunately not very fruitfull) about adventages of acoustic vs digital pianos and vice versa.
Good luck with your project!