Another point to toss into the mix, CB --- the strong force operates at two distinct geometries, which could mean that it is essentially bifurcated and overlapping to begin with, such that one of the two can become the 5th force.
On a size-scale of a few femtometers, the strong force binds protons and neutrons together. But on a smaller scale there is a different version or subset (carried by gluons) that holds quarks together. It is the second scale which may be related to neuglu. This force has been called the “color force”. Both categories of strong force can inherently produce new massive particles instead of gamma rays when disturbed. For instance the muon chain seen by Holmlid supplants gamma radiation when the color force is involved. It is possible that neuglu is the merger of the color force combined with something “from” the weak force (meaning the W or Z). From: CB Sites Jones, I really like your idea. I instantly thought the same thing when I read the article about the 5 force. It certainly is better than some published theories I've read on LENR. From: Bob Cook …How do you explain the transfer of the excess energy to the metal lattice as heat ? Ø Hagelstein’s theory for phonon transfer keeps improving over the years. In his theory, the less energy which needs to be shed in the first few downshifts, the more likely the modality becomes since the spread between frequencies becomes manageable… and starting with about 1/3 the starting energy of normal D+D -- due to retro-causality, perhaps the neuglu hypothesis provides a better fit for Hagelstein…

