I'd be very careful with blending. realize that lacto can quickly take over an entire brewhouse, and doesn't always come clean with what you put it in. If you ever go from a keg with lacto in it to a normal beer, you have to replace all your seals and give it some extra care because the stuff is tough to kill.
Go ahead and see if you can find some way of blending it, but be careful.
Also, you'll want to make sure that if you're at a happy place with the sourness of that beer that no more oxygen gets to it. Lacto will turn into vinegar pretty quick if you let it.