If you were installing a modern(ish) group on an old frame, would drill the fork and bridge for recessed allen key brakes and keep the whole group together, or just spring for some of those nutted Tektro dual pivot sidepulls to avoid modifying the frame?

Group is 9 speed Chorus and the frame is Mercian, for reference. And I realize this is a deeply philosophical question for many. I'm just interested in other opinions.