Some clubs had a meeting in BKK last sat. I was in the middle of the Pacific Ocean then, but here is what my Thai friend says when asked what they discussed:
"It's obviously. No register vihicle can not be run in publication road.
Just invoice or make new number on the frame, illegal...
Invoice + tax (excise) = ok, but still can not be use in public road. You may use it as a race bike only in circuit..
The thing is, it is not everybody can pay this tax(excise), it must be the company who especially set up for this matter.
Then, you only can register when you already pay the tax(excise) and pass the TIS.
Anyhow, Thailand will use the higher standard in near future... that's mean it will be very difficult to pass this standard.
And it means the registration price will be much higher than today...
Luckily... yours and mine already registered, don't you think so...?"
A bit lost in translation i think, not sure what he ment with some bits.
Tom