Not that many of 'the ole school' around these days Frank.
However, I wonder if one enquired 'hard enuf' - there may / may not be any of the old hands who would just 'like to do it' as a volunteer, just for the sheer pleasure of it, to keep these marvellous machines airworthy, as do the various other 'enthusiasts' who keep tourist railways etc running....
It would have to be 'signed off' by a LAME I realise - but - 'tis just a thought....
Cheers