I removed the two axles from the bike: Turns out the front axle is 110mm long and the rear axle is 160mm long, each with 30mm of thread.
- Pinhead offers 125/160mm axles "The skewers can be trimmed to the correct length. You should install them and then trim them so they extend about 5mm beyond the fork on each side"
- Pitlock offers a "universal axle which has a continuous thread that you can short".
I have no idea if those will work and how easy it is to short an axle while still being able to screw a bolt lock on them afterwards. Has someone tried it?