I thought I’d read in the book that there were MP penalites for longer weapons in cramped spaces, but can find noth­ing. Would you typ­i­cally just con­sider it the range of the shorter weapon and make that dif­fer­ence the penalty? Or Am I approach­ing the idea wrong?

My aorta rup­tured not too long ago and I under­went emer­gency surgery, which has seem­ingly erased my mem­ory for many things.

I don’t recall any such rule.
We just ruled that swings were not pos­si­ble and you could only thrust. Had a block­age in a door­way once that the frus­trated player could only clear with a shield/​body slam.
Assum­ing you can’t Ter­rain Check your­self to a less cramped posi­tion.
Just in case this you missed this, I have attached the com­bat walk through.