I have a Wire Fox Terrier myself and a chap we know has a Welsh and several Airedales. Our Wire Fox and the Welsh get on really well. But the Welsh is a little pest on the stripping table, you have about 20 minutes before she tries to escape, where as our Wire Fox will be good for up to an hour now. He says that they are know for being super stubborn.
Just bear in mind they are a Terrier, it’s like having a teenage child, some days you have communication, some days you’re wasting your time.
I would have one,(don’t tell my other half) but I’m a terrier man.
And good on you for looking for a rarer breed, don’t see many Welsh about.
Good luck.