is there a way to reverse this... as well. from MS to PS?
Sure use copybase in modelspace, and paste to paper space.
or
(Defun c:Ms2Ps ()
(setq CRT (getvar "Tilemode"))
(setvar "Tilemode" 1) ; Change to modelspace
(prompt "\nSelect objects to copy to model space: ")
(setq SS1 (ssget))
(command "_.copybase" "0,0" SS1 "")
(setvar "Tilemode" 0) ;Change to paperspace
(command "_.Pasteclip" "0,0")
(setvar "tilemode" CRT);
);