Look at - try cPlane - orient to all views
Snap to might be scriptable - just for centers of objects
I have a lot of time mess in my scene with snaps options, if scene grows dramaticly -> i have to open several Moi windows to do small stuffs in other windows, keep all tangecy that i need there & one for collecting with few snaps/low mesh angle detail
a saving way for ai I see making a 4k-8k res render of view ( with hight contrast lines ) & trace in ai, manually shade surface inside Ai