Small boats, like a Boston Whaler or RIB, are unlikely to have a ladder that you can climb up while wearing tech dive gear regardless of how strong you are. The usual procedure for re-boarding the boat is to clip your harness to a gear line, pass stages / scooter / camera up to the crew, doff your rig in the water, haul yourself over the gunwale like a sea lion, and then pull your rig up (maybe wait a few minutes so you don't bend yourself).
As others have pointed out, the only real use case for diving with one deco gas plus one bottom mix stage is doing two repetitive dives in the 150ft / 46m range on one boat trip where boat logistics don't allow for two sets of backmount doubles. I have had this come up a few times and it works fine, although it's rarely necessary, so it's not surprising that there was little demand for a specific training course.
On the other hand, it would be nice if GUE still offered something like the discontinued Tech 60 course targeted towards boat dives in the 200ft / 60m range. You can do those dives easily with (almost) normoxic 18/45 trimix in backmount doubles plus two deco gasses in 40ft^3 stages (no bottom mix or travel gas stages). This gives you access to a huge number of dive sites with simple dive planning and a manageable rig. The Tech 2 course, which introduces hypoxic 15/55 back gas and three stages (i.e. bottle rotations), is a big jump from Tech 1 and in practice seems to be a more than what many divers want. But apparently there wasn't much student interest in Tech 60 either.
