I know the gun will accept the Romeo 1 red dot..Does anybody know if there is any plate adapters that will accept a Holosun?

Try these guys, they probably have what you need.

https://chpws.com/product-cate...d-dot-apater-plates/

CHPWS stuff is junk. I have purchased on more than one occasion.

Forward Controls Design is making the best adapters for the M17/X rear sight plate cut.

Depending on which version of the X Carry you have, BoBro also makes a plate for the version with the removable rear sight plate.