Thanks Sixxno! Yep, I’d already done that. I can totally fiddle with that line to change things for myself locally at the point at which I want to remove the grind a little. And I can even distribute that as a very simple mod which you can simply toggle on and off.
The overall goal is that you should have to spend something to get this upgrade, whether it’s a trinket, a skill, a buff, a district building, a building upgrade, it doesn’t really matter. But, I don’t think it’s possible, because you can’t pass the extra_stack into an effect – you can only hardcode to something.