On what level do you build your amps? Do you make your own chassis, eyelet board, and/or cabinet?
If you must have a mid control, your choices are limited. The only Fender tweeds I can think of are the 5F6 (-A) and 5F8 (-A). There are more choices in the Brown/Blackface era that you might consider. There is also the JTM45.
How much do you depend on having a layout. It's a fairly simple mod to add a mid control to most post 59 Fender amps.