my American BW specs. OG 1.130+ (>32 brix pre-boil) FG 1.040, ~4 gallons left in keg

my mentor suggested adding water which will bring it down closer to 1.032. i'm thinking of adding .5-1# 500* chocolate to add some RIS-esque flavors whilst i'm diluting it. any suggestions?

If you don't want to dilute you can try adding a healthy starter of Brett. It won't bring it down a ton but will drop a few points probably down to 1032 no problem. How does it taste? Is it good on all aspects and just to sweet? If so you could blend in a little dry stout if you want some dark malt complexity and dryness.

I dosed a barleywine with the dregs of a bottle of Surly 5. Havent been able to check on it, but I’m sure the brett is chewin the hell out of the sugars. Cant wait to see how it is!

Why not use another beer to blend in with it. Maybe a simple pale ale? You probably wouldn't need much for the right ratio. Even getting it down to the low 1.030's would be fine.