Personally I would refuse. I’d be worried about the risk to my reputation if they weren’t happy and even the risk of litigation. Most people regret over thin eyebrows and I think it would be easy for your client to persuade a solicitor that their eyebrows never grew back properly and they didn’t understand that they might be permanent regrowth issues, or that they were vulnerable and shouldn’t have been accepted as a client.
I would refuse any slightly out there request though because I’m more of a mainstream salon and that’s the business that I go after. Most of my potential clients would be horrified if they read an online review saying “she waxed my whole brow off!!!”
I always say to my clients that I play safe with styling brows and if they want a “highly stylised” look they will need to come for several appointments and we’ll gradually get there over a few visits. I have a young man who likes a very precise look. It was quite a transformation and I was anxious he’d feel self conscious so I refused to do it for him on his first visit. (I didn’t explain my reservations I just said “I can’t stick it back on if you don’t like it”. )
He’s come back, raring to “go for it” and I’m happy that he understands how his request will look. He didn’t mind my initial reticence, I think he appreciated my care and concern that he should be happy with the look.