You can:
1. Modify and fit '05 Tiger alloy wheels.
2. Buy 2nd hand alloy rims from a similar bike like a V-Strom, modify and fit them.
3. I am unsure if they exist for the Tiger hub, but BWM uses alloy wheels that are called rim spoked on their Paris Dakar models. The spokes terminate in the outer part of the rima nd therefore outside the tyre sealing bead. these wheels look good and are very strong. I don't know if the spoke number or angle allows conversion. A good wheel builder should be able to help.
4. By Dymages to fit.
5. Use silicone to seal the spoke nipples on your current wheels. This was described somewhere in this forum, but I can't find it.
See Here
Tubeless wheels for a tiger?