@sigross I tried a couple of these, even one of those adjustable laptop stands and they just kept falling short. Like the wooden one shown here - the lip isn't substantial enough and would need to be modified to hold the tablet. And you'd want to then put some kind of grip material on the surface so it didn't slide around.
I think I actually spent more money trying to adapt cheaper stands than just buying the real deal hah.
But like this one here from Huion from what I tell will go into any vesa mount configuration and it's $50. So far that seems to me to be the most reasonable one that is the most adjustable. I bet some of the other knockoff manufacturers also sell similar stands separately, but I can say this one is very solid.