No guy, just me.
I don't know the specific lug you're talking about, but it does remind me of a lug so special you need to get a special crimping tool just for that. The lugs I looked at I spent a lot of time searching through Amazon to get the correct lug. I buy lugs from Amazon that are 4/0 to 5/16"; 4/0 to 3/8"'; 2 AWG to #10 stud, 2 AWG to 3/9" stud, and a whole lot more. Really wherever the project takes me.
Crimping is not that hard if you take you're time and do it right. Not cutting wires away when stripping insulation is important, and I think hammer crimps are an awful way to crimp a wire, unless perhaps you're soldering after. Still, I think a hydraulic crimper, available for a little over $100 is good up to 4/0 wire, although it comes ith dies much thicker. I feel if your calculations say you need wire thicker than 4/0 for a solar build, you need to up the voltage at that point to keep the current down meaning thinner wires.
Crimping smaller sized wires is part of what I used to do for a living, but I had a 27 year break between that job and my solar RV build.