Either 1 or 3 depending on how your creative juices flow. I do not recommend 2 unless AI can generate the adjustable models for you with low effort. Artisan made 3d graphics is a whole lot of effort which will detract from the overall game making effort.
Given that you are just simply a casual game maker I do not recommend stepping away from AI so that you can focus most of your limited mental effort on game making. Although there will always be those rabid anti-AI dudes you can just simply tell those minority SOBs they are not the target audience and that they should look elsewhere for indie games such as steam which actually has the games using AI tagged as such and can even allow the user to exclude specific tags from their search such as the AI tag.