I thought you may have some more rare and expensive items, I would definitely fly with them if you feel you can pack them well enough. The luggage fees are FAR less than import fees, and you don't have to have customs rummage through your stuff unattended for weeks.
I think some people maybe underestimating the cost of your equipment. Shipping by container is liable to be flagged for import fees, which if you don't declare (with receipts) they will look for the highest price online and apply a 10-30% fee. While I'm in a different field of audio (car audio engineer), bringing a few suitcases of equipment could very easily land a $3000-6000 import fee 😅. So depending on the cost of the items needing declared, it maybe far cheaper to fly in with everything (or even rebuy here, I did this with my PC and work stuff).
+1 for DTV not being for long term. You aren't applicable for a bank account, while you can live here on it, it's intentionally difficult to do so as that is not the intent.
it's to keep foreigners from taking the business opportunities of the locals. The lower cost to open businesses are left to them so they aren't flooded out of their own market.
To note it's my understanding that it's 2M in registered capital, not invested. But to understand the thai legal difference I would talk with an agent. That's your best bet, doing it yourself without a Thai local helping will be difficult.
I would assume it heavily depends on where the income comes from. For me, I do not pay Thailand first because my income comes from the US. My US taxes are taken out of my salary and bonus's, and paid into US bank accounts. While I am a tax resident, with a work permit, my income is derived from outside the country. This is why I suggested whoever to talk to a Thai tax expert, ideally one with experience in expats.
depends if you have a tax treaty. US taxes paid count towards Thai taxes, and in reverse. Always good to check as it can obviously save you quite a bit.