I have never found one for Honda. I've read posts here about a man named Guhl. Some have sent their ecm to him to be flashed.
I used to use TuneBoy on a Triumph, had a tool to read codes on a BMW (gx911). I started looking for something like tuneboy for a Honda for a friend about 10 years ago. Honda and BMW are the only makes I know of that tuning is not readily available.
I would like to turn off the speed limiter. I'd be hesitant on other mods until I fully understood the parameters on shifting the dct. I don't race, and I'm actually getting pretty conservative (slow) in how I ride these days. The idea of cutting the top end is just repellent to me.
I'm hoping someone here has an answer.

 

I think there are now 3 companies that make "Power Commanders" for 5th gen Wings. I don't recall what all are called, but here is one that's been around for several years. I believe these have various choices, as well as going to stock settings.

Honda GL1800HP Gold Wing Audio/Comfort 2015 | Dynojet

Dynojet is the world leader in for your Honda GL1800HP Gold Wing Audio/Comfort 2015 . Shop online!

www.dynojet.com

 

If you're talking about removing the speed limiter, that applies to the 2018 and newer wings. Guhl Motors flashes the ECM to remove the 112 mph limit on speed. You remove the ECM from the bike and send it to him. After a few days, it is returned to you.

It doesn't appear DynoJet makes a Power Vision or Power Commander for the new wings.