A Deluxe Space Conqueror mirror would be very close, as would a Criterion 4".
They'd both be 2+" shorter in focal length, though you could just adjust the primary mirror position by sliding the rear cell forward, and possibly adding some spacers to prevent the rear cell full extending, or shortening the length of the rails. The secondary would still be undersized, unless you swapped that out too. Not sure it makes much difference at f/11.5 vs f/12.
Either way, seems a shame to butcher one classic for another, unless you already had the spare mirrors on hand. Certainly wouldn't be cheaper than a recoat, assuming the Eikow isn't scratched past the coatings.
The thought only occured to me because I could get Chinese 114mm mirrors for $25 or less.