I don't use Bitwig Studio, but am interested in it. On that basis, here are my thoughts...
You might want to try solving this problem with Steermouse or BetterTouchTool. See the discussion under Can the Mouse Scroll Wheel Be Used as a Trigger?.
I see that it is possible to zoom in and out in Bitwig using the + and - keys on a number pad. I can imagine that you might not find this an acceptable substitute for using the scroll wheel, but this way at least you wouldn't have to use the control and option keys.
Modifier keys are used frequently so should always be conveniently positioned. I wonder therefore whether they cause you problems in general. If so, consider relocating them (Karabiner-Elements or better still, use a programmable keyboard that uses QMK or similar).