Just get a different spider/rings.
looking v. spendy for new rings and the chances of someone swapping the other way are fairly minimal so would probably to sell the entire crankset then try to re-buy compacts at a sane price.
They are merely £50 more than any decent chainrings tbh. But yeah you can get a 6800 crank for less than the cost of those rings. 24mm axle tho ..
There's little you can't ride in the UK on a road double with a sensible cassette
Although you do tend to wear out the bigger sprockets :)
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Just get a different spider/rings.