After stripping bleed holes on 2 calipers last year I discovered the inserts in the link below. For anyone who bleeds their brakes often, is worried about stripping their calipers or those with weeping bleeders, these work great. They are available at Pegasus Racing or on EBay (free shipping on EBay).
https://www.pegasusautoracing.com/productdetails.asp?RecID=9836
https://www.pegasusautoracing.com/productdetails.asp?RecID=9836