That design is so similar to other star ratchet hubs I've serviced that there's half a chance that another star ratchet freehub like a DT Swiss one would work fine
Yeah that's always an option, maybe with a bit of machining in the worst case, although the Wiggle Q&A pages do say that they're not compatible. Don't have any to hand to test it!
https://www.wiggle.com/p/prime-sr2d-disc-brake-rear-hub
https://www.wiggle.com/p/prime-sr2d-disc-brake-front-hub-grey-12-x-100mm
£59.98 for a set of star ratchet disc hubs. Came with end caps.
Only problem is going to be sourcing freehubs if Wiggle goes bust I guess