What you could do, is get some upgrades which will still be usable for when (note when, not if) it breaks, because it almost certainly will break sooner rather than later. So don't waste money on trying to tart it up internally, just use its capabilities to best advantage, by doing the following, none of which will be a false economy...
So, a decent sight will be usable on a new gun just as much as it will on that thing, a decent three-point sling will too, as will a tactical light and a tactical front foregrip, none of these items need to cost too much money, none require a UKARA, and all will easily be usable on a new gun when you get hold of one. All will at least make the gun a bit more usable, i.e. you can spend some time zeroing the sight in, to shoot more accurately, a three point sling will allow you to get it into your shoulder quicker and make it less of a pain in the ass to carry, a tac light is useful for indoor CQB, whatever gun you happen to be using, and a tactical foregrip will improve your accuracy and speed up you acquisition of targets, and you can put the thumb switch for the tac light onto it with some gaffer tape.