ANO: Public transport and aerial work – exceptions – flying displays
265.—
Valuable consideration given or promised to the owner or operator of an aircraft taking
part in such a race, contest or flying display and such valuable consideration is not more
than the direct costs of the flight and a contribution to the annual costs of the aircraft
which contribution must bear no greater proportion to the total annual costs of the aircraft
than the duration of the flight bears to the annual flying hours of the aircraft;
.
As long as you don't exceed the running/operating costs of the aircraft, be it owned or hired and you fly it yourself, I reckon you are watertight.
If you are offered the chance to hire an aircraft and the pilot, be careful, that's AOC territory and where it starts getting sticky.