He Ed... long time no hear!
anyway, one thing to mention... they haven't actually mentioned that it will not work together.
the latest reply is "nobody has tested it"
trouble is that they don't work normally... but you might be able to get them to work in analog mame (if they each act like a mouse... but multi-mice aren't supported).
so if you get them both... plug them both in... and see if they both can be used to add a click... if so, it will be worth trying analog mame
btw, did you preorder at a znet site? (retrogames is one)... then your orders are gone... they dropped all the orders for some reason... kinda annoying since I preordered a LONG time ago... and I'm at the back of the list to get one.