Suspect there aren't many volunteers to pay those costs but is probably worth those that want Manston to be compulsorily purchased to be suggesting that the other major London airports and government should be paying towards the costs of keeping Manston open so that in cases like this a damaged aircraft can go to it instead
It's not just keeping it open, but manned up with comprehensive Fire Cover etc.
NB the VS340 landed at LHR, and blocked a runway for 24hrs? or more. Despite being requested to "bog off" they did not, and Manston was available. This incident always was looking likely to end as it did (runway closed for an hour or 2, then tow off), whereas the 340 was known to be going to land and not be moveable.
The "fallout" of this incident in disruption terms will likely be less than the NATS computer **** up earlier this month...