brazing onto chrome

Attachment 108902
Looking for pointers on whether/how I should handle a braze-on on a chromed fork for a front rack, 24pack from Surly, planning silver braze.
I was planning either on drilling the 1/4" hole for a stainless H2O bottle boss (stuck on with tape here for the pic) or using a barrel style boss (customer preference not my first thought, but I will do if able), and wondering:
A) best practice in sanding/filing the chrome away, outside with ventilator
B) how far do I have to remove chrome to not make a toxic mess
C) not sanding/filing on the drilled bottle boss hole option (but not the barrel option I wouldn't think)
D) telling the owner I shouldn't mess with it
much thanks
andy

Choose D.

If you decide to tackle this project, sand the chrome off at least a couple of inches all the way around the heated area. Then respirator and good ventilation while you braze. You do not want that stuff in your lungs.

Personally I'd give you the same advice Richard gave.

I decided to return the bike to the customer.
Thanks for the council!
It would have taken hours of time to deal with toxic dust for a job that would look at best like crap when done.
I realize I don't want that part as my "brand", even if it's just a hobbyist:)
much thanks