I can see this being a very advantageous modification, my only concern is the tailstock being lifted off the bed on one side due to torque twist under operational loading.The tailstock on my lathe, which was built in the Far East, will lift of the bed if not locked down whilst undoing the drill chuck if I give the key a hefty twist.
On the other hand I have had a problem with the tailstock slipping backwards under load when using large drills, I fabricated a larger clamping block but the problem is not totally gone, but I can see this modification would definitely improve things if it can be used in conjunction with the tailstock clamp and the saddle lock.