A 3-row FC with another row of switches would be fun.
I use a lot of off-board switches for pre-defined stuff that needs no (or little) indicator light/label. Tap tempo doesn’t need a lighted/labeled switch. The blinking LED works fine. Bank, preset, and scene Increment/decrement switches are another good candidate for off-boarding, as there are other ways to see their status.
The one thing that does need some status indication in my setup is the lead amp channel status. Two of my off-board switches are set up to give instant access to 3 channels with one tap. I "waste" a switch on the board to get a status indicator by setting it up to toggle between B and C, with C as the primary and label set to current channel. The switch is then dark for A, dim for B and bright for C. The off-board switches are set as A (primary)/B (secondary) toggle and C (primary)/B (secondary) toggle. Whichever channel is on, the switches give me the other two with one tap. A is 'low gain', B is 'mid gain', and C is 'high gain', so the light brightness works well as an indicator....