I think it would be jolly nice to standardise with QNH and a decent TA, such as the 18000' used by the septics.
Aren't we supposed to be moving towards a higher TA? I seem to remember reading it was going to 18,000. Or it might have been 6,000. Can't remember.
As Pontius says, there's no extra workload for a PAR. In fact as one of the few civvies I suspect that uses them I can attest that they are the easiest hand flown approaches by far of the lot.