Very strange that someone tasked to give you proper advice on Thai visas advised getting a DTV of a Thai child or girlfriend category. These categories do not exist, and that should be known to many, if not to those tasked to advice visa applications. Are you sure that this really happened?
I don't know how remote work really works, obviously you wouldn't work in Thailand but your job would offer you substantial time IN Thailand while also being employed. Could that be what she meant?
Otherwise, just get the custodian visa. There's a visa category for that.
unlimited entries by land, relevant for you if you live in Laos as per your story. But unlimited stay is something else. Entries by air were already unlimited.
Doing
*****
of your time in country with many entries could work for a long time because you spend substantial time away before coming again. But on a bad day you could run into a slightly stricter IO, and get refused.