The aluminum wrenches actually aernt for doing assembly, they are for removing and tightening hose ends, the adjustable aluminum wrench might work for assembling hose ends, not sure...
Ive had real good results with using aluminum soft jaws (hose end goes in that v-shape notch in the soft jaw) in a vise, then i use a regular (thinnest one you've got) end wrench on the hose end and install it, just gotta be careful when its about bottomed out that you dont scratch anything. I put anti sieze on the threads and a little oil on the tip, never had a leak or failure and rarely scratch them when assembling.