Well the patch will be, build your system from scratch. You have to reinstall all that kde/plasma stuff with it recommends, yes that's the patch! But you have to wait till the transition is over.
Or you have snapshots, than you can go back, that is the case if you have formatet with btrfs.
Third, you can fetch the latest kde test build and reinstall your system, and wait with full-upgrade. nala upgrade and run apt upgrade, i do not know the nala command for it, --nofull maybe.