If anything you should atleast be able to click on the item and convert it to imperial, until they fix this issue because yeah you should have your races motif.
You need to gather 'nickel' which is the imperial style stone. I have an imperial character and I have no issues crafting in Imperial style as long as I have the stones.
I don't think you get the imperial race craft unless you bought the imperial edition and made your character from that. If you used a race change token to get the imperial race I don't think you get the craft with it.
I still have this issue, and I bought the Imperial edition boxed set back in the day, and I've been an Imperial since day one... here's the kicker, I used to be able to craft in it, but somewhere down the line they messed it up (my bet is when it was added to the Store).
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