The Fujinon-T has a flange focal distance of 259.2mm (old version, lettering inside) or 252mm (new version, EBC, lettering on the barrel) so you'll have no trouble focusing either one. Since the 45CF has 356mm maximum extension it won't be overly extended so things should be fairly stable.
Another lens you might consider is the 400mm f/8 Tele-Congo. Mine is branded Osaka, which I think was a house brand for Bromwell Cameras. It's about the same length as the Fujinons and, like them, takes 67mm filters, but has an even shorter flange focal length of 236mm. It's also lighter - with caps and retaining ring my Osaka weighs 482 grams, my EBC Fujinon weighs 632 grams, and my old-style Fujinon comes in at 804 grams (yes, I have a 400mm lens problem). The Osaka's image circle is smaller, 200mm versus 220mm for the Fujinons, but it's plenty for 4x5 use. The Osaka is the one I carry when I'm going any distance.
The 360mm Nikkor-T weighs 835 grams (Nikon's literature says 800 grams for the 360 but I weighed one and it was 835), a little less in the 500mm configuration. It would work fine as a 360 but you'd need a top-hat lens board to use it as a 500 - otherwise it will just barely make infinity focus on a 45CF. Stability could be an issue because of the weight and extension.
There's also a 500mm f/9.5 Tele-Congo. 67mm filters, 515 grams, FFL 287mm (well within your 45CF's capabilities), but not very commonly seen.