Guild Wars 2

I’ve transmuted the Holographic Dragon Wings over the back piece you get from exchanging in your fotm tokens. I’m worried that I can’t put the transmuted item into the mystic forge to infuse it now. Help!

You can still put the item in the forge to infuse it. The looks are irrelevant for the recipe.
However, cause the looks are irrelevant, the backpiece you get out of the forge will have the looks of the capacitor and you will loose your wings that way.

Bottom line, if you plan on transmutating an item, make sure you dont have plans with the item in the mystic forge.

You will be able to. The mystic forge technically destroys the items you put in and gives you a new item. You will lose the wings skin.