Not sure dude. Probably for bi-cycle there will be no permit needed, you just need to have your own permit. Anyway, go prepared, you'll have everything on spot - so should not be much hassle.
Elaborating point 4.
- Bindaas possible.
- True. Simply reach Phuentsholling and approach any local agent.
- Officially, no. Unofficially, Bindaas.
- No issues at all.
- Yes. That is necessary.
- Indian will do.