> But the way you make that tougher to accomplish is by adding more checks and balances or repealing laws granting excessive authority to the executive.
That is what I describe as the "package" of reforms, yes.
> The thing that would help that is a constitutional amendment prohibiting court packing.
Good idea! Pack the court, and in that law, include a trigger provision that repeals it as soon as said amendment is passed.
(This has similarly been proposed in gerrymandering.)