The recent jupyter notebook demo for an interactive interface to LMFIT has been packaged into a repository and posted to GitHub:
If anybody has any troubles with it, please post an issue to the GitHub page.
The biggest flaw so far is lack of support for setting parameter expressions ('expr' keyword). The input validating for this one seems like it could be a bit tricky. Not sure if I'll give this a try yet, or wait to see if there's much interest in the project before pushing this forward.
Lastly, if there does seem to be interest in the project, and it does get developed into a stable tool, I'm not at all opposed to pulling this back into the main LMFIT project.

William