It's been a while since I've shot the .22 conversion at 50 yards, but as I recall the difference between my 50-yard M193 zero and a 50-yard zero for regular High-Vel .22s is quite a bit. Something like 22 clicks on the scope. I'm sure it'd be more for the 60gr SSS. I shoot the .22 conversion mostly at 25yds with a detachable handle and the 25-yard setting for it is pretty close to the 25-yard setting for the .223s, but that's I think 7 MOA up from the 50-yard setting and 8 MOA up from the 100-yard setting.
Not too long ago I ran some trajectory charts on a thread for someone asking about the difference in POI for the different rounds, but I can't seem to find the thread right now. I think it was in AR Discussions. I used the
JBM Ballistic Calculator which let me put in the .223 info and zero range then I recorded the Elevation angle (the effective "sight setting") and ran it again with the .22LR info and that angle to see where it would go if I didn't change the sights. IIRC the .22LR shot low at all distances, but I don't recall how much.
If I were you I'd zero the EOTech and ARMS#40 for 50 yards with your "combat" ammo and then see how far off the .22s are. I'm guessing it'll be too much for you. You should be able to find a setting on the A2-style BUIS that works for the .22LR w/o moving your front sight. The IBSZ page on the MD-AR15 site tells how to move the markings on the A2 elevation dial which might help get the correct setting at a number you can remember. The best way I can think of to handle the optics is to have 2 of them. I have a 2-7x on mine and I just picked up some cheap rings so I can put an old 4x I took off of a used .22 on it for shooting the .22LR instead of dialing in all of the clicks.