Multiple Shift Buttons & The same button for shift and arm track

Maybe it sound weird but for what I'm trying to do would be so much easier If somehow I could do that.

Lets say I have a controller with 4 pads. Each pads activates 4 tracks on witch I have different instruments (piano, pad, synts, orch).
On each of these tracks I have an instrument rack that contains multiple types of each instruments that I wanted to be activated by the same pads.

What I essentially trying to do is this:
Press Pad1 - arms track 1
The same Pad1 acts like a shift button so now the rest of the pads acts like device activator so I can choose what type of Piano I want.

Does this make sense?
It is possible to accomplish ?

Thanks!