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@Howard
There’s some info on crank options here
https://forums.mtbr.com/cannondale/f-si-crank-options-1026662.html
And some lfgss dickheads you might recognise.
The Tl:dr on a new crank for an ai frame is to use cannondale’s cranks and ai specific chainrings.
‘Normally’ built up wheels can be re-dished to / from ai unless the builder was either extremely accurate and wasted no spoke thread or mucked the wheelbuilder up in exactly the opposite way you need to re-dish. Mavic aluminium system wheels cannot but that’s probably a moot point here.
I’m not sure if you could use your crank on a normal frame - it might be ai specific. Or at least the chainring will be. I wouldn’t have a frame built up as Ai because boost gets the same result and everyone has adopted that.