So, been changing my mind again. Shock, horror!
As convenient as the fully headless setup is, it still requires a screened device to access, and will need a family extensive hardware controller to get the full functionailty I am wanting.
I've toyed with various layouts today; no screens, two screens, all of it:
I've finally made my mind up again:
One screen is the winner.
The effects pedal will remain as is, with its output connected to the small Alesis C1 interface of the recording Pi, now sporting a screen.
It will also be connected with an ethernet cable.
The recording Pi will run reaper (or a Python recording app of my own design further down the line), and Also RaspAP. This will allow the Pi's WiFi to be used to connect to my home network and allow the ethernet port to share it with the other Pi.