Yep, we always cook ours in the microwave and they always come out delicious. We’ve done it like this for maybe 15 years.
The secret, if there is one, is not to overcook it and to allow standing time, so for instance, a 1lb pud we do 1min 40seconds on high, stand for 4 minutes, then 2mins 20 seconds on high again. Job done. This is for an 800w microwave. We usually make our puds in November and they keep well, without drying out, till Christmas Day.
We reheat it in the microwave too, on Christmas Day.
Funnily enough, the recipe we use is in our original prestige pressure cooker book which was a wedding present 45 years ago. Kept the book but ditched the pressure cooker years ago.