My regular film strip holders (Epson V850) will easily hold a two-frame strip of 24x70+ pano negatives (two strips wide). My old glassless ones will hold three frames, I think, and take three strips. Neither one has frame divider bars; that's all done in the scanning software (Vuescan), so I can load up two or three strips, set up the frame edges and exposure, and go do something else while the scanner runs (that much film takes a few minutes at maximum resolution).
Now, I'd need a frame mask to get good prints in my D5, but that's not a big deal if you have a 3D printer -- just print one to fit the 4x5 or 6x7 negative carriers.