In fact it's a bit strange how there isn't more anti-psi tech in Underrail (anti-psi field generator, psychic nullifier collar/straight jacket, mind reading resistant/immune helmet, etc).
I'm actually more surprise how there isn't any cyborg and/or biological augmentation since BioCorp already seems to done tons of research on them.
Well, I think to restraint a psi users we can use a very simple method: Booze him up 24/7.
Considering cost of military hardware(cost of home security is not a joke) I think it is much better investment to keep the psionics boozed up rather than buying up expensive machines to keep them down.
As for cybernetic argumentation, we have already seen plenty of them. That one guy had a cybernetic eye. One of oddities you can find is a cybernetic part.
And as a rumor, I've heard that future characters from north underrail may have cybernetics.
BUT, as a solder or scavenger I think large, combat cybernetics are not very effective. From what I have seen, every item you have can and will break with enough uses. Having one mechanical limb in this world must be costly and require heavy, constant maintenance.