i knew some1 who has done this. it worked for the purpose you describe.
the pdef gains will be minimal on cloth (compared to stam/def statting, and you might even lose pdef), and you will lose quite a bit of mresist and mdef due to lack of wisdom.
i'd just be wary of hp checks and/or non-% aoes. while they are few and far between (for the moment), you never know what the next content might be.
in short, traditional healer statting is safer, especially when you take into account that you ARE the healer.