You youngsters wouldn't remember but way back in the '60s, an RB211 was fitted to a VC10 to replace the 2 Conways on one side as a testbed; it was so successful the Chinese offered to buy VC10s if they could be fitted with 2 x RB211s.
I'm not saying fit 2 x RB211s 'cos they're a bit long in the tooth nowadays, but there must be a more modern equivalent; now that WOULD be quiet.