You sure could, instead of naming it ent_0948_0_0_3.bk2, you would just name it Apron.bk2, Banner.bk2 and so on, then put it in the Movies/SS/path of character your gonna replace, if you need a video I can surely make one tonight and post it up for you
in Cakeview, go to UI/Assets/Roster/TypeA find the roman reigns render you want to change, copy the file name and place the render you want in your Mods/Renders/UI/Assets/Roster/TypeA and name it exactly as the roman reigns file, then bake the Renders folder