I am about to do that part-time. Here is how it happened to me.
I worked on various idea full time for about 2 years now and I joined a new accelerator about 10 months ago, working on my last project <a href="http://www.relinkdevice.com"> Relink </a>. I use to talk a lot with the other startups about their problems and give them as many advises possible based on my previous experiences or what I learned in books (Lean startup, rework, blogs, marketing books, etc.). Now, everyone come to talk with me about their problems and look for my point of view. People managing the accelerator have a background in finance, lacks sometimes marketing or entrepreneur skills and noticed I become quite central in the accelerator.
I think the key take-over is you need to be credible to do so. There is some people who advice startup having a background in business but I believe it's much easier if you have/had a startup yourself.
You can contact me on twitter (@Atresontani) if you want to discuss that further and see if I can help you.
Thanks for your comment. I don't want any interaction on the device side because Alzheimer people won't know or remember how to use it. For people who can still learn, that, indeed, might be better. Merci!