Endsleigh Travel Insurance
For what its worth.....
Few years back aged about 47/48, I went on hols to malta, having arranged with the local microlighting club to do some training with them.
I knew that my travel ins would not do the job.
Endsleigh, the student insurers have a policy for the nutters who do bunjy jumping or white water rafting et al. I phoned for a quote: £30 ish for a fortnight, defo flying training covered.
Worth a look. Even for 2 months or whatever.