Ok. Bought the Crown OPDA.
Should this still be OK to drive around town until it gets here?
Depends on if there's damage to the cam gear already. If so, you're only making it worse. If it's bad enough, you may only be making bad into worse.
Not trying to worry you. I'm talking from experience of the dealership replacing my cam after the OPDA ate it apart (and then the dealership didn't wear in the new cam and it then ate the flat tappets necessitating a new engine - but that's another story).
The 'plastic alignment plug' that comes with the new OPDA is a great tool to remove and check the existing OPDA while keeping everything 'keyed together' (I kept mine for any time I take the OPDA out and used it several times since). You can try the screwdriver or punch method mentioned around but I always found too much slop to get the OPDA back in correctly again - new or just a pull-and-check. YMMV
If you're talking 'around town' being a few necessary miles here and there, you MAY be okay - but it's a gamble until you get eyes on both gears.
If you can avoid it, less miles the better until you can pull it and be ready with the Crown unit. Do be sure to get eyes on the cam gear. If it's worn significantly, the crown unit will only extend the inevitable.
FWIW, my original OPDA that killed my cam never made the 'angry monkey' sounds before it ate up the cam.
Not here to scare you, just sharing my shitty experience from an unnecessary change to a 'small' part - 2 years before stopping manufacturing of the engine - that became an engine killer. <rant off>