"Aperture Plate" = "Film Holder".
(Bad habit of mixing metaphors. )

I have two lens cones. The longer one (4-1/2 in. ?) for 4x5 and a medium one (3 in. ?) which I believe is for medium/120 format.
There are also two flat plates.

I have two condenser units. 6 in. dia. and 4-1/2 in. dia.

I have two film holders. 4x5 and 60mm x 60mm for 120 format.

I am guessing that all I need for 35mm is a film holder and a lens to match. Correct?
(The 4-1/2 in. condenser could be used for 35mm... because the lamp is 75 watts, light loss from the smaller aperture would go unnoticed.)

I'd be interrested to find out whether my EL-Nikkors would work.
Again, this is a guess but I suppose, the flat plates could be adapted to hold them, assuming I can collapse the focusing bellows enough to bring them in focus.
This would probably need some experimentation to verify or not.

I like the Beseler but I find it to be a pain in the butt to keep aligned.
Once aligned, the Omega seems to hold its alignment forever.

Like others have said, I'd also like to be able to use one enlarger for all formats.