I went from Europe to Thailand last October to January. Was in doubt about the same things, and now I´m almost 100% sure that excluding traffic across the Persian Gulf, there are no international car ferries in that region. They are a thing of the past.
You should be able to ship the bike from Bandar Abbas by ship to Mumbai, or from Tehran by air to Delhi, for example. But that is a hassle. We decided to go to Pakistan, and it wasnt bad at all. But things might´ve changed, so I dont really know how it is nowadays.
East from India, they said in Chennai there had been a ferry (to Penang, Malaysia I think?) in the 80´s, but then it burnt, or sank, or both, so no ferry after that. And Burma is a no-go, but again, there are plenty of options by air or by sea. We opted for air, Chennai->Bangkok, cost roughly 600 euros total for the bike, plus maybe 200 euros per head for our flight tickets. Cheaper to put the bike by sea, but it could easily take 1-2, even 3 weeks, when you count in the processing time at both ends (the sailing itself wont take that long). Air cargo moves much quicker.