Anonymous participant you need to look up the definition of work in Thai law. Working in Thailand, remotely or otherwise, without permission is a breach of the law unless you have permission to do so via either a work permit or via an appropriate visa. A soft power dtv doesn't provide such permission
You definitely need an ending balance over 500k baht everywhere but some want to see that every month for 3 months or longer. Other consulates stipulate the amount in the local currency which might not equate to 500k exactly
But if you are eligible for a Non-O visa it seems to me the simplest thing for you to do would be to get a 12 month extension of stay each year then you can come and go as much as you please
the DTV has no option for visiting a partner. If you want to get a DTV to apply for one of the soft power activities then decide what activity you want to do then look for an approved provider in the area you want to be