That was what I ended up doing but with a firmer chisel, I don't like mortice chisels.
Rebate plate wouldn't have worked with the angle tried a plough plane as well but same story.
Of course a firmer will do it. I started to use mortice chisels a bit more once I discovered how good they are at cutting mortices! The Ray Isles 'pig sticker' is a favourite but the Narex range are worthwhile too.
I find that I can get cleaner edges to mortices with a cheap firmer chisel.
@Airhead started
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That was what I ended up doing but with a firmer chisel, I don't like mortice chisels.
Rebate plate wouldn't have worked with the angle tried a plough plane as well but same story.