The current Scrum master was a manager who took a couple days agile training class paid by the management is now leading this agile team.

That's your problem. Managements want some Agile, they don't really know what it is, and they impose it to the teams. That's pretty much what to do when you want to decrease significantly the productivity of your developers ;)

The new process proposal should come from the developers. Or at least be reviewed & approved by them if it's a management's idea.

In any case, if the developers refuse it, don't implement it! Or it will be the disaster you describe.