I think the real problem here is that a rusted-on chairman is acting autocratically without even consulting owners on what they want.The long term solution is to get rid of the chair, which can be easier than you might think – a simple majority vote of the executive committee can remove him from office (but not from the EC).
As a temporary measure, why not get everyone who wants a remote control gate opener to sign a letter saying that, as members of the owners corporation, you require him to reinstate the RCs and give him seven days to do so.
If he refuses, or fails, start the process to either get the EC to vote him out of office or, if he has only his cronies on the EC, to hold an EGM to sack the entire EC and vote in a new one. That is harder than it sounds as it would require a 75 percent vote.
In fact, the easiest way might be to keep your powder dry until the next AGM when you will only require a 50 percent vote to elect a new executive committee.
In the meantime, be prepared to be pilloried and generally demonised, so keep the other RC owners informed and onside. But sooner or later, all dictators end up in a bunker, wondering why everyone hates them.