Behind banishing gate #2 in garlaige citadel (go through (s) and use a flower), there are 11 beetle pops in a row. If you use a low damage weaponskill (and providing it's unoccupied) you can limit your downtime between pops to a couple of minutes at most. Nothing aggros in the way.
There are 2 epish pet beetles in saur S near each other. So they really safe and such though wont last as long as far as tping on them. But could just feed them some with low nukes giving yourself some and steal it or just sit there and take it idk. Since they pets they respawn faster than most beetles
You don't have to go behind a gate. Go to Garlaige, drop down a hole to Serket's room.
Don't melee the beetles, only WS them, TP off some bats instead thus killing the beetle with as many WS as possible. 8-10 WS per mob, easy, and you won't overrun your repops. If you can't handle a bat and a beetle at the same time, get the hell off DRK.