consider Retroshift .. the Front Shift lever, then, is not the STI .. ka thunk .. shifting ,
but a continuous friction.
You, then, still can shift from the brake lever Hoods..
Friction downtube shifter for FD?
worked for Armstrong..
[I've just run bar end friction for both sides , my more is better stopped at 7 speeds]
[x3 chainrings]
R'off is a 7 speed IGH , used twice.. dual range..