i have used a small folding net with a telescopic handle for years now, it is great because i can extend the handle for landing fish if i'm on a rocky outcropping and can't get my hands on the fish.
it's only drawback is the net size which made landing big fish hard to do as they would get 2/3 in net and then get all tangled up >:( >:( >:(!
as a solo fisherman sometimes your trying to land/unhook a fish and steer at the same time  :-/ :-/!!
this year i bought a new item from Cabelas called "THE FISH GRIP".
it's a cheaper version of the more expensive tool you've been discussing.
it' made out of high impact plastic with stainless hinge pins.
it's sort of like a "visegrip" for fish, squeeze to lock on and flip handle to release.
it's a bright orange, so you shouldn't lose it, it FLOATS and has a WRIST strap as well.
it way's only 5 oz.
the BEST thing about it is the price, $ 9.99  ;D ;D ;D!!
it also has a notch in handle to attach a small scale to.
it's not the "precision" tool the other one is, but IMO it would do most any job that you would need on a trip.
if i works out like i think i'll note it in my may trip report :D :D.