I don't want VAR in Scotland for a few reasons but one of the main ones is how it takes a big part away from celebrating a goal when you need to wait for a VAR decision. From a supporters point of view the instant reaction when celebrating a goal is the best part, so anything that messes with that will be a further step in reducing the enjoyment of being at a game.
Just needs to be a proper unbiased review of refereeing decisions by an independent panel after every game. The panel should use video evidence to review incidents. The panel then provide a report that is publicly available to all, which summarises the referees decisions and which team they benefit. The bias in refereeing decisions would become obvious fairly quickly then corrective action would be taken to ensure the worst referees are dealt with.
We know there's some kind of refereeing bias in action against Rangers but it needs to be illustrated more clearly before neutrals will accept it.
Only way I can think of making the bias clearer is scoring referees performance using a standard scoring template. For example, game changing decisions could be worth 5 points. These would be things like penalties, sending off, ball over the goal line. Bookings, corners, throw-ins and rest would be given a lesser number of points. The review panel would award each team the relevant number of points when they get a wrong decision in their favour. For most games we would expect Rangers to come out with a significantly lower score than the other team as we don't usually benefit from incorrect refereeing decisions. For example in the last Celtic Rangers game at Parkhead where Clancy was the referee then it wouldn't surprise me if Celtic ended up with a score of over 30 due to 5 or 6 match changing decisions all incorrectly going their way. That one game would set alarm bells ringing about that referee, although in most cases it would take longer to work out if there were issues with certain referees.
Once this data started to build up over a month or two I think it would be obvious that there's a problem with quite a few referees in Scotland. If not then there would be evidence at hand to prove the wrong decisions even themselves out and everything is fair as possible.