Hi Chris,
I'm not quite convinced myself, but the amount that the wingtip extends in front of the un-slatted leading edge looks a lot like the tip that's in
Tristar 500s photos above. I may have a photo somewhere that I can use for comparison but it's in a box in the basement.
Here's a 100% crop from the photo above:
As for the combustor starter, the Operations Technical Manual (for an EAA Super!) says:
In the combustor air valve the pressure is reduced to 300 psi. and the air at that pressure is supplied to the combustor. The flow of air into the combustor automatically initiates fuel injection and the fuel/air mixture is ignited.
...
The combustor further reduces the pressure of the air supply to 33 psi at the same time increasing the temperature and kinetic energy of the air which exhausts from the combustor directly into the starter inlet.