The unusualfier will likely sell for more without being used anyway, i do think scrap accept those, but i am not sure if they go on the same bot so you might have to make it in two separate trades
Give it a try by going on the "buy unusuals" section, selecting the one you want and click on "select unusuals from your backpack as a payment" instead of "pay the rest with keys and metal" that should show any items the bot accept, if your unusualfier isn't there, that means that either they go on the "items" bot instead or that it's overstocked