Certified to Experimental?

Just wondering. Is it possible (read practical) to take a certified
aircraft (C172 for example) and have it "demoted" to an Experimental?

Seems there are LOTS of great options out there for non-certified flight
instruments (EFIS's and such) available for not much more than a song and a
dance, but you can't put them in a certified plane (my understanding
anyway).

If I'm a fair weather, non-commercial pilot, why would I care if the FAA
stamped my alternator or not? Cause if they do, the price jumps 500% for
the same part that's on my Dodge.

(all that said, I understand that the certification is there for safety
purposes and that I will lose the "promise" of the FAA saying that its a
well proven part).


Thanks