IIRC it's due a cam belt anyway?
I would suggest removing the cam belt, then pulleys and backplate. That should give you enough visibility of the oil pump to block interface to decide if it's leaking. I suspect the oil pump is sealed to the block with a gasket, so that might be all you need to cure it. Maybe someone with an engine out of the car could comment on what else might need to be removed to get at the oil pump? Crank pulley needs to come off, so the correct tools required there. Maybe the upper sump would have to be dropped?
I assume that the feed from the oil pump goes straight to the oil filter. That means it must pass down an oil gallery in the passenger side of the block, so the output of the pump must pass into the block in that region. That's backed up by the location of the relief valve on the pump, so yes, a possibility that it'd leak there, I'd say.
I had a troublesome coolant leak a couple of years back. It kept emerging forwards from that little channel in the top of the sump pan, just to the passenger side of the block. In the end it was the water pump seal, so leaks from the front do seem to be able to track back down the block and emerge there as if they come from further back.