Thus far, the Sandbox hasn't been a limitation for what I want to do - it's pretty clear that that's the way that Apple is moving, and I don't want to invest too much into something that Apple could eventually put behind some very scary dialogs, or worse.
I haven't taken a look at the boundaries of your functionality. If you allow custom keywords, scripting, etc., though, I'd probably run up against the sandbox extending it, even if you didn't with core functionality.
At any rate, I will check it out from Setapp, and I'm glad to hear you're still supporting that since I'd use it from there. I don't mean to be a jerk in my response, and I do wish you the best.
Lacona just happen to resemble exactly the kind of app to which I apply these sorts of criteria and I think the rest of the Keyboard Maestro/Alfred/Hazel/personal automation crowd on Mac is similar. It's a niche crowd, and I think one aspect of the niche is less sandbox is better. Another is that we want to know your tool will outlast your business if necessary, before we build our tools on top of it, so we purchase anything useful outright if possible.
Then again, maybe you end up being the mainstream Spotlight replacement, especially when the switch to ARM throws everyone else's privileges up in the air. Good luck!