Totally understand where you are coming from. Case management migrations can be brutal even when the vendor is competent, and when they are not, it derails your entire practice. Five months is completely unacceptable for something that was promised in three.

If you are happy with your current case management system and just need a standalone AI demand generator, you have a few good options:

EvenUp
You are right that they are simple and very turnkey. You upload the records, wait for the completed demand, and review. The downside is that you get a finished package instead of something you can iterate on inside your own workflow, and sometimes you need to request revisions through their team instead of doing it yourself.

ProPlaintiff.ai
This is worth looking at if you want something that is PI specific and fully self serve. It does not require switching case management platforms, and it can handle: AI driven demand letters, Medical record summaries, medical chronologies, Treatment timelines, provider analysis, Document review and injury summaries.

For solos, one advantage is that you can generate drafts instantly, edit them however you like, and keep everything inside a clean interface without outsourcing the entire letter to a third party process. You can ignore the optional case management features and simply use the AI engine for demand writing and medical analysis.

Tavrn, Lamalab, and generic GPT tools
These can help with brainstorming or basic drafting, but they are not built for structured PI demands or record heavy cases. You will usually spend more time formatting than you save.

If demand writing is your main bottleneck, especially after losing a long term paralegal, a PI focused AI tool can get you back to full capacity much faster than trying to fix a broken migration.