score:7
As far as I can tell reading on the embassies websites there is no reason for them to stop you at the airport at either destination. With the switch in BKK (Bangkok) I believe you will not enter customs and your luggage is automatically forwarded.
The people at Bangalore have the option of stopping you if they think you will be refused entry to your destination. If your passport is enough to get you a Visa On Arrival then there is no reason for them to refuse you the flight. Also there is a chance Hong Kong would refuse you if you can not prove your continued itinerary, for that reason there is a chance they will stop you at Bangalore on the same grounds. A return ticket fixes this, or proof of continued traveling to other destination.
So bring the usual stuff, your passport and (return) tickets.
Good luck!