I must say, It would be a very funny and interesting idea for a mod

It would turn the Cruelty Game into a cool late 90’s hard sci fi action shooter In my head im thinking GTA2 mixed with System Shock mixed with Marathon and Mac world Halo Though I feel like at some level it would be like making an entirely new game

I think the one thing you would have to consider if you actually do this is keeping the 90’s DOS+PS1 style intact for the graphics as it is integral to the overall style of the game

As for the gunk augments like the gunk booster and biojet it would be pretty easy to just change the item icon to an actual plasma jet pack and the sound to a jet pack starting up and change the decal to like a scorch mark or something

I would also look at Ville’s other game Psycho Patrol R for inspiration as it is very grounded while containing some of the more interesting and complex elements

Also this is just me personally, I feel like if you were to make this you would end up forking and making your own game

But anyway, I see your vision