I had a relatively small one at the front. So so pleased i did.
A good quality surgeon in the UK will do a good job that looks natural (cheap turkey ones can look as unnatural as the teeth). But it'll cost here. Definitely research the surgeon. It's an art.
They also very rarely fail when done well, and the transplanted hair should stay as long as the hair at the back and sides does (ie maybe forever), where the follicles tend to be male pattern baldness resistance..... It's the follicles they transplant, not 'hair', and that's where they come from, your own follicles from back and sides.
The problem is the remaining natural hair on top which will continue to be lost. Hence:
Finasteride is the daily pill to stop the rest on top succumbing to male pattern baldness. It blocks DHT which the hormone that causes it, which comes from testosterone. I have no side effects and side effects are rare.
The one side effect most are scared of is erectile dysfunction so many don't take it, hence then needing further transplants as the rest on top falls out. You shouldn't need it to retain the transplanted hair tho (see above).
However, the evidence for ED even being a side effect is sketchy. The 1% who got it after taking it may have gone on to get ED anyway given the age of those who tend to take it.
I agree if you support him with this from family money then it would fair for you to get to spend the same on yourself, or at least something you really want that he might not that's for the family.
On whether women find men getting 'work' done a turn off is for you all. Even if it's a double standard (ie you'd support women but not like it in men) then no problem - we all can't help what we find attractive. But I've seen plenty (dating apps) outright saying they don't like balding or bald men too!
And dont underestimate how much men don't like losing their hair. Altho we seem to fair better with things like weight and age not affecting our self esteem - and i agree that is a massive privilege we take for granted too much - this one thing is the one that can possibly be as demoralising for us as those things can be for you. I think we're just less likely to admit it, partly because of feeling societal pressure to not care - to admit it would be 'not manly'.