doctorbadwolf
Heretic of The Seventh Circle
Well, the main things I'd want for an Inventor Rogue would be 2 infusions at level 3 and another at 9 or 13, proficiency with tinker tools and one other artisan's tools, and possibly a mechanical magic pet familiar. I honestly don't even need a full spellcasting table for such a character, that would just be a bonus. Maybe just a few cantrips and the other stuff, even.OK. Now we're starting to get an idea of what being a Rogue means to you, could you go into a bit more detail about the Artificer mechanics you want?
A simple Arcane Trickster variant with more support-oriented spell list and the adjustment to Mage Hang Legerdemain would seem to fit as a basis.
The point would be to have a rogue who creates cool things. A tinker's weapon could be really cool, since we're talking about a rogue, as could some new infusion ideas like a grapple gun, or maybe some magical traps in place of spellcasting.
Any of these things would work. I'm not suggesting all of them. I always end up having to clarify that when I'm listing potential ideas for some reason, even though IMO it should be obvious that if someone is listing potential ideas they aren't building a class in that post.