"Transphobes will misuse it" isn't an excuse to hurt and suppress other trans people's experiences.

You can't come up with a clean version of trans that phobes will embrace. That's a hill without a summit, using others as the stairs.

"Transphobes misuse". Full stop. That's all you need.

Even if you silence every single voice that isn't yours they'll keep misusing, because it's not supposed to be fair. Theirs isn't a set of standards we'll ever meet. The goal is destruction.

Policing other trans people's feelings and experiences isn't going to do anything except help achieve that.

Trust me, 'Sweeping less palatable subgroups of your minority under the rug and your enemies will no longer be able to hurt the rest' has a long history.

That history spans contemporary trans communities, and far beyond those borders. Many groups try this, and have tried it in the past. If you still earnestly believe that's the right thing to do, I implore you to go away and research it.

It has never, ever worked.