you could use gildors unreal model viewer. you can extract ukx.(repcom's animationpackagefile) into psa.(animationfile) and psk.(modelfile) with it. then you import it to 3dsmax with an importer which is also made by gildor. but its pretty impossible to get it back to repcom.
so yeah, my suggestion: use accessoires. go to the actor browser, untick placeable classes only?, make a new subclass of accessory and add it in the default properties of the pawn.