This is a non-issue. Most of the "gas to the face" is due to the suppressor restricting gas down the bore. With adjustable gas blocks (for piston or DI) or playing with weights/cycling in the system (BCG or Buffer or Buffer Spring) you can minimize this. The DI AR system allows you to modify these factors more than most piston systems. FWIW whether it is with my Hux FLOW cans or my traditional baffle cans, my MCXs are more gassy than my ARs with properly sized gas ports (or my uppers with adjustable gas blocks or bolt carriers).
Consider an overbored solution as well (7.62 can for a 5.56 upper). You may sacrifice sound (however most 762 cans tend to have more volume to work with due to larger size), but it also helps decrease the amount of blowback through the barrel.