Adjustment range is around 7-8mm total, so you could mount in the middle(293mm) and adjust slightly up or down from there. More hassle than a regular binding tab on a track for adjustment but could be done.
Good to hear!
Yes, about 8-10mm plus or minus adjustability on pivots with a bit of play on forward pressure “okay range”. Thinking you’ll be a hair out of range with a 12mm jump in boot sizes. Old holes will be sealed and hidden under the heel piece so you won’t even notice.
With all due respect, where are you coming up with that adjustment range? I'm misundersatnding you I think? All of my skis have FKS/Pivots on them for many years. I mount them. Bend the brakes. Have used dif BSL boots in them on same mount. They can and will adjust to a 20mm range and that is not conservative.
3 "rings" on the struts. If you are mounted in middle of range (middle ring just visible) then winding in to most forward/1st ring that will get you ~10mm (and you can wind it in until it stops to get a bit more) and same going the other way. I do have one old set of skis that is in very regular use wound right in past the lowest indicator with zero ill effects.