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It is a very good idea I've got a silly question. All buffered lines have pull-ups. Do you want to keep them HIGH when they are nor used? In my understanding they should be LOW if they are not used/active.
Bear in mind that Jupiter ACE TZX files should be converted to ZX Spectrum timings if you would like to use a bulk standard TZXduino firmware.
BTW You might find my Twister (JACE -> ZX81) useful and more details are there: http://www.jupiter-ace.co.uk/hardware_twisterboard.html
You can find some information about the CF card mass storage there: http://www.jupiter-ace.co.uk/hardware_ACF.html
I am not sure if the modified ROM has been ever published.
From photos I can see this is not the board which I recreated. It seems to be a Russian PCB.
Good work with keyboard, and keep my fingers crossed for it.