"If" me.. I'd probably find a decent 4x shotgun or maybe a 3x7 slug scope and throw on it. I'd view it as it ain't gotta be nothing fancy, it's just gotta work for xxx yards. Yeah, I deviated a tad... Besides.... I don't think I've killed anything with a x39 other than a groundhog, so realistically me scoping one has no benefit. Deer.... Well, I just use old faithfull...a 45-70....
Killing a deer or hunting is not necessarily the pursuit here, but sticking to the 2 options is. It could also very easily be used for home protection, taking out zombies, or whatever situation that might arise.
But that aside, are you then saying you don't believe having visibility through the optics at the same vision level as your eyesight is important?(IE: 1 power capability)
Me, personally.... not applicable to every Tom, Dick and Harry.... I don't typically do well with scopes at close range i.e. under 100 yds, everything up until the last 10-15 years was open sight/peep sight/aperture target sight, because thats what my Marine Colonial grandfather and Army father beat in my head, if you can't hit it that close with an open sight, a scope probably won't help much. Now, I own hand cannons with scopes...and in a way, I wished at times they were open sight.
To me, "IF" this x39 weapon in question was "my" only choice, and if my only option was to scope it and I had to have it that bad for home protection, taking out zombies, or whatever situation that might arise, stuck in an urban environment, I'd suck it up and put a 1x or a 2x scope on it and figure it out, but use low power more or less simply for the field of view. If I were a rural area where you could go easily beyond a 100yds.... then I'd choose a scope with say 3x7, there is where I see benefit of multiplier for distance, but still get the decent field of view at a lower power.