Pan-Am had it as an SOP at Heathrow with their German route 727s in the 1980's, presumably to save money when they were on their last legs. No drama with the high engines, just used 1 & 3 as I recall.
Never saw a Trident try it.
We officially disapprove of it at Gatwick, though as Piltdown Man says, amazing how expediency can change things! There's no reason why we can't do it, we do need to see that there's no alternative pushback arrangement available before approving it.
We did once literally push an Embraer once with half a dozen blokes on the leading edge; wasn't very difficult to get moving. However, the following day the a/c Commander had obviously thought about the potential damage to his leading edges and we had to clear an adjacent stand so it could 'spin' out instead.
Cheers,
The Odd One