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@Jonny69
Is there an indexed trigger shifter that would work? I’m thinking along the lines of one of the SRAM or Shimano left-hand 3x 8/9/10/11 shifters. Will one of the SRAM pull ratios pull the correct amount to index correctly at the back? Left- hand 3x shifters are properly out of fashion and you can pick up even high end ones for buttons.
Useful list of common pull ratios, spacing etc here: https://www.artscyclery.com/science-behind-the-magic/science-behind-the-magic-drivetrain-compatibility/