Dura-Ace FH-7403 (Hyperglide - HG) freehub or freehub body

[Foghat]

I have an old wheelset, in good condition, with Dura-Ace 7402 hubs, and want to get it back in use by converting the rear freehub body from Uniglide to Hyperglide to enable fitting 10sp cassettes.

Unlikely to be many FH-7403s knocking around these days, I know, but it's worth asking.

I have the ultra-rare Shimano tool TL-FH10 for removing/fitting these freehub bodies.

Thanks.