Yes, that might help.maybe looking at my schematic for the current sense in the two polarity options and how the jumpers are configured between polarities, might give you some clues in hacking your device
The 2000 Watt LT has a HV section polyethylene or polypropylene white box to full width of 19" rack and 3.5" tall.
I've started looking at the schematics of the Glassman ER you made available, and a manual for the EW that I have. I'm turning the schematic pages into .pngs with improved readability compared to the original scans and rotated orientation to be readable on screen. I'll make those available in a bit.
Probably comparing ER and EW to the circuit boards and terminals and analog front panel of the LT power supply will help in reverse engineering it. I found the person at Glassman who was helpful with another model a few years ago has a linked in page, so I asked for a connection... maybe he can find a way to help again, but probably not. It's probably DIY reverse engineering from here out. Could take a while to budget and spend the time.