Only way it could be 'stolen valor' is if you're a trans/queerphobe, & that'd just be called 'lying' & 'a dick move'. Just do what feels right.

I do have a few alternatives though:

If you want to be clear you're an ally, there are ally variants, though I wouldn't recommend going that route unless you have a queer friend/loved one who's happy to call you an ally before doing so. Some cis people claim to be ally's & then continue to buy jk Rowling trash or be weird about pronouns & 'dude'. Don't want to muddy the waters.

Otherwise, you could just get something like the progress pride flag if you don't feel like being specific.

Edit: misspelled 'variants'