Potential Work Around
Posting this for anyone in my position with the same issues:
**NOTE: I have to verify this before acting but it looks like it solves the problem**
Visiting US Forces to the UK are permitted to ship personal effects without paying VAT regardless of the purchase date or composition as long as it is not a prohibited item.
US Forces simply fill out a form validating their status and detailing the contents of the shipment. The item will go through customs as any other article would but no additional taxes will be charged.
I'll come back and let you know if this worked and I'll update this as the process goes for anyone else that might be asking this question.
Looks like I'm ordering an RV-7 kit!