He doesn't think those policies are good for Trump now. Because he is completely ungrounded by any moral code, the moment he judges one of those policies has become good for Trump, he will openly embrace it.

True, but it's incredibly unlikely that would happen. Trump doesn't need Heritage for much at all - so why would he care what they want? To help Kevin Roberts out with his project? I doubt it.

So why on earth would Trump lift a finger to help Heritage pursue their policy preferences?

Sure, there's some preferences they have in there that happen to be the same things he wants - because they copied a lot of his positions. That was part of the point of Project 2025, to bend the knee to Trump's policies. But anything else? If Trump decides he wants to do switch course on a policy because it's become good for Trump, it will be solely and entirely because it's become good for Trump. Not because it's in Project 2025.

Project 2025 might indeed be a blueprint for what the Heritage Foundation wants to see the federal government look like, and there probably isn't a politician in the Republican party who cares less what the Heritage Foundation thinks is a good or bad idea than Donald Trump.