[BlouDon]

Suggestion:

Retain the stomp starter for starting for oddity/novelty/aesthetics?

In simple terms:
From 12V switched ignition -> stomp switch -> solenoid activation terminal.

(It would be prudent to to also have the neutral safety switch in this circuit)

The starter's main current will come directly from the battery to the large terminal on the starter solenoid. Only the solenoid activation current will come via the stomp switch to the smaller solenoid activation terminal.