Good call on the AF-XiED units. Especially, if you can get them while in the States. You'll save a fortune.
I did consider a Hilltop remap, but, like yourself, travelling to the mainland and all that it entails, made it uneconomical. No regrets with my choice and imagine that I would get a good percentage of my money back if I changed to a different bike. No chance at the moment, enjoying it too much.
Just an observation.
When other members are making observations about computers, fuel strips, final drives, etc.
Bear in mind, that if going for a TC, many of these issues that are known on the SC, don't apply.
The TC doesn't have a fuel strip and I've ran my fuel computer down to 4 miles remaining. Which I think is pretty accurate.
When looking at a used TC, don't get too obsessed about whether it has ESA or not.
Look at it from an overall point of view. Dealers call a bike with no ABS or ESA, a 'poverty spec' bike. Not my my words.
It probably won't have the chrome exhaust or the (very accurate) fuel computer or heated grips or LED indicators or PANNIERS and TOP BOX either.
Most GS's will have these toys included from new and there won't be a massive difference in the second hand price from an (ahem) poverty spec bike.
McCallen's in Lisburn had a GS for sale last year and it looked like a goodish price. But when looked at, it was a very basic bike. Be careful and know what you're looking at.
Don't buy without panniers and, preferably, a top box. You'll need a grand even for a second hand set.
It's not difficult to go across the water to buy a bike to get more choice. I bought a used K1600GT in a Manchester dealer a couple of years ago. Flew in that morning, he had a taxi waiting, bought the bike and was in Holyhead for the boat to Dublin that afternoon.
Home about eight that night.
There's one thing there's no shortage of and that's GS's.