Pay your penny and take your pick. Yes, IP time at the FTU would be helpful but if you intend to go guard or reserve after separation aligning yourself with a unit now would certainly be a plus. And it sort of depends on how many years out we are talking.
The big retirement wave at the Legacies will start in a couple years and peak about 2023. The numbers you have now would likely get you an offer after six months of knocking the rust off from your staff tour at a regional. Get the rust knocked off on another assignment and it’ll be even easier, but what’s that? Another three years?
Don’t suppose you are eligible for Palace Chase or similar?