As far as I know, just about all vintage-style "ashtray" Tele bridges are magnetic - it's only the more modern American Fender and Gotoh bridges which aren't, they have thicker chromed brass baseplates.
As you know ( :)), some "boutique" companies like Glendale make non-magnetic stainless steel ashtray bridges, but regular Fender ashtray bridges (and copies) are magnetic, non-stainless steel.
So I'm sure you'll be fine - the BKP Tele pickups were probably voiced with vintage-style Teles in mind.