Obviously you can get a work permit for remote work. I make my BOI company, get a work permit. Ooops. Does not matter if I work remote or not. LTR visas are all about remote working. I can work for another BOI company and get a work permit for remote work. And there is the new upcoming visa ... Every European company can organize a NON B visa for me and a work permit, and I work remotely.
"- DTV - is not available yet and only last 180 days" is supposed to last 5 years. But only 180m days per stay. So after 180 days you have to leave the Kingdom and reenter.
That is not an airline issue but an Immigration issue. It helps no one if the air line does not care but he has no prove of onward travel when the immigration is asking for it.
Then you should probably move for a while to another province. I'm not aware about such a change in laws, but immigration offices like to bend them. Here where I live my TM30 from the next police office is not accepted. By law it should. They even tried to fine me, and I have no idea if it was fraud or a fine that went to the office.