My favorite PT topic is something along the lines of "if you could only do one (or two) exercises, what would they be?" This is partly because I'm a minimalist and also because I'm on call 24/7 - one minute I'm brushing my teeth, the next I might be packing my gear for a 6 week hitch on a boat in the Gulf of Mexico. Any sort of structure beyond A/B isn't really plausible (and depending on the vessel's workout equipment and seas, I'm generally very limited to certain lifts, especially those that call for over-head lifts).
I've searched this forum several times recently to find the old thread to no avail.
You are not an accomplished Olympic lifter (you cannot clean/jerk or snatch because you lack adequate training) though you strive for the functionality/practicality of the skill. You have at most 2 days a month to train in a hypothetically proper gym on land. What lifts do you perform?
Because my job is physically intensive and requires a lot of pulling, my choice for a singular non-technical lift would be thrusters. But to compliment that unskilled motion I would also throw in DL high pulls.
There's an old saying that sounds something like this, "If you're stuck on a desert island and there's only one lift you can do, which one would it be?" The answer is always the same...back squats. If I was as limited in my training as you are, I would squat every time I got a chance to lift.