Ummmm.... Did you forget that Trump wants to be the nominee of the Republican party? If so, he has to do it by their rules. Otherwise, he could try to go independent (though that would be almost impossible at this point with sore loser laws and filing deadlines).
Trump might be able to jump on the libertarian ticket they are on the ballot in 48 states!!!
I doubt there is even 5% of voters who had any idea their primary votes could be dismissed at the whim of a few thousand party hacks. As a GOP voter for over 30 years, I certainly didn’t, and I have followed elections a lot closer than anyone else I know. It may seem normal to you, but to the other 95% of the people it looks shady as all he11.
If the GOPe persists in doing this, those other 95% are going to see how the game is rigged and will leave the party to form a new one where the rules are as I’ve laid out. This is a Republic and we expect to vote directly for our representatives, not have some separate process pick them without regard to our votes.