Red Dot for Field Target ??

No, nope, nada, just the wrong choice for this game. You could try it of course but you'll probably only get a 10-20% hit ratio, if that. Part of that is the paint gets shot off the KZ, and surrounding it on the face plate in the direction the wind is blowing so your assumption of the where the KZ is will be wrong.

Though it'd be fun for me to try once for the heck of it. No rule against using a spotting scope see where the KZ is and dialing elevation in the RD.