They are just smugglers they would make a deal with you and ship bike on your door step,
the only way to make them legal is to get the chais of a dead (same bike/ may be older year) and shift all bike to that old "registered chasis"
get the bike impounded intentionally by going to custom house and telling the officials that you want to get this bike impounded and tell them you need this bike back, they will promis (with a little fee=bribe) that they will auction the same bike to you and will call you in next few weeks.
You pay them a little extra and they will park the bike in a VIP condition too so it does not get damaged in your absense...
for strategy #2 you need to have good high level personal relations
for stratgy#1 you need to be lucy to find a dead old same bike to use its chasis.
their is no other way or else you can create fake papers which is risky if customs investigate on ur bike or if some one reports you.
I checked chaman bikes, these bikes are parked there.. along many other choppers and cruisers..