I call them veneered veneer's
I took a piece of 3/4" plywood the same width as the veneers, put sides on it for my press (picture).
I mad 2 parallels (hard rock maple) about 1/4" thick.
Let us say that A veneer is canary and B is Cocobolo
In my press i put A in first, then my 1/4 Parallel, then A again glued with smooth-on.
Now I have a 1/4" veneer sandwich.
Glue up B and the other Parallel and B.
Now you can splice the two together and rip down the middle and thickness sand back down to veneer's. Your veneers will have hard rock maple on there belly, you can thickness sand them to .030 or .025 or what ever
I skipped alot, like, Plastic wrap, Flat surface for clamping, razor blade for scraping glue at the splice before thickness sanding, Parallel's with no snipe,after glue up thickness sand the veneer sides before ripping, and so on.
My Finished veneer's were .030 thick, guessing .015 back and .015 belly after thickness sanding
Think about it some and build them in you Head 1st.
Mine turned out really good.
Good luck
This is the press