Well, you could probably put together a 4s DD fet driver like the TA46-Multicell and use an externally mounted high current mosfet or bank of smaller mosfets in parallel to handle the high current.
I don’t know what you’re trying to achieve. If the design is arbitrarily based around the SFH55, you could consider instead to design around a goal, in which case the SFH55 might not be the ideal LED by which to achieve the goal. There are plenty of LEDs that could be more readily powered by a few dc-dc regulators operated by a single multi-gang pot. (I’m not sure if a non multi-gang pot can be used to control multiple drivers, but I know that a multi-gang pot will definitely work.) Smaller LEDs can achieve a decent beam in smaller optics, so you end up with higher power density within a given volume. For instance, you could be running round die L90 LEDs in ~32mm optics or whatever size, powering them with one or more 1800w boost regs, or a bunch of 400w, 500w, 600w, etc. buck drivers. The buck setup is good if you want to avoid higher output voltages. Whether buck or boost, the type of dc-dc reg to use are the ones that have both CC and CV adjustment pots on board. You set the current limit via the onboard CC pot, and wire in an external pot to control the voltage ADJ. This gives you full dimming all the way down to 0% output, and current limit at the top end if needed. Some of these buck drivers have a circuit for low voltage shutdown, but it’s often not documented, and you have to swap a resistor or otherwise maybe add a trim pot to adjust the cutoff.
I did some more searching:
SZ-8025CCCv: 600w buck driver. Claims 25A max out.
AP-D5830A: 800w buck driver, claims 30A max out. Two of these might do the job, and they would fit well with a 140mm fan. I tested the SFH55 LED to require 3.1V at 30A, which is 93W, x 8 is 744W, with a string voltage of 24.8V. If you power this with a 12s pack, keep the voltage above 37.2V (3.1V per cell) to keep the input current to the driver below 20A, in theory. There is a 20A input fuse.
There are substantially more capable boost drivers:
AP-D5060B: 1500w boost, 60V in max, 70V out max, 30A out max.
AP-D100A2000W: 2000w boost, 60V in max, 80V out max, 50A out max.