I do use modern SE blades in the Rapide, and if positioned carefully, they work fine.
Had a shave w/my 1912 minute man this morning. Very different razor from the MMOC. This will take some getting used to. The shave sounded worse than it felt, if that makes sense.
Lather Catchers will put you on the balls of your feet if not careful. If you need to borrow anything Nick, you know where I am.
I own 15 or so SE's...the most aggressive of the bunch are the OCMM, my 1907 wooden handle lather catcher and the 1914. All good razors - not nearly the selection of blades compared to a DE though.
BOTOC - TOFLAC-U - AOM