Try using solinoid operated shotbolts that go into the B-pillar from the door??

I know it sounds silly, but someone told me about it, that they'd seen it done on a mini ....Can't remember who said that though.

I was going to do it to the clubby, got the actuators cheap, but they were a bit big to fit in the doors, but anytings possible, for a roundnose, as said above, it's possible, but I don't think it's practical, but clubby/rover, go for it!