Re: Appendix in memoir's article class

I don't understand what you really want. If you have a document that is
written using the article class and want to change it to memoir, well,
just change some macros (\chapter, \section, etc) and that's it. Maybe
boring, but not that hard, just find and replace i think. And memoir is
worth it, at least for me.
It will not be compatible with article class, but if you use "...other
extensions that memoir does on latex...", it wouldn't be, anyway.

So please tell us what you actually want, and it will be easier to help