>>as our engineers are not familiar with the algorithms used by receiver manufacturers to add delays in the positive direction

Look on the bright side. If they ever figure out a circuit that can introduce a negative delay into a single channel they'll be so rich they can hire lots of engineers to fix your problem.

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8