Sadly I fear Spitfireman might be correct.
I’ve often wondered myself how we go on when historic jet aircraft are so expensive to maintain.
The only way I can see is ‘approved’ non OEM suppliers and maintainers if that can be done safely. Even so it wouldn’t be very affordable in the current financial climate.
I think we are all going to have to pick a project and support it whatever the cost. Most of us have had to do that with XH558 and it seems that might also be the case with Sally B. Use it or lose it. We choose to have a hobby that just happens to be expensive.