If the wheels are Truspoke, they haven't been made for a while. Finding one may be next to impossible. I think your choices are:
Find a wheel on Ebay or somewhere
Have BWW repair your existing wheel _ it can't be that bad, can it?
Get four new bolt on wire wheels from BWW
Get new splined wire wheels & knock off adapters from BWW
Go back to the original disc wheels
Get new original knockoff wire wheels, hubs, & associated hardware from Moss or somewhere similar
The original axles for the disc wheel Healeys may or may not be a different width than the wire wheel axles. Does someone know for sure?
BWW has the parts to do it several ways but it will cost a bunch!
https://www.britishwirewheel.com/conversions.htm
Dayton Direct-Bolt Wire Wheel Conversions
Dayton direct-bolt conversions include 4 chrome wire wheels—sealed tubeless (normally 64, 70, or 72 stainless steel spokes), 4 caps, chrome lugnuts, and wrench. Call or write for Dayton color brochure, or pricing on painted wheels.
Aston Martin (’71–’85, BB5E) $1715
Austin-Healey (BB5E) $1715
Sorry I don't have any better answers, I hope someone on here does.
D