You're missing the point. Whether you need a braze or clamp front derailleur is a straightforward issue,which calls for a simple answer. No issue there. But this whole thread has you asking for advice about fit and gear selection, where there are multiple variables and
no straightforward answer.

What I and some others are saying, is instead of asking strangers who lack any basis for these judgement calls, you use a local resource who can make sure the choices are right for YOU.

Now, it turns you have a shop, who'll do the work, and is willing to advise. I suggest you use those resources to the max and review your other decisions so you end up with what you need. But as I've said before, it's your bike, so do as you wish.