Chemical exposure with SnCl2 (Stannous Chloride / Tin(II) Chloride) is easy to do either with second developer or as a separate bath.See Jens Osbahr's pdf at: http://home.snafu.de/jens.osbahr/pho...r_reversal.pdf

This takes care of emulsion peel off problems as well as repeatability issues of re-exposure but somehow most people tend to lean towards light exposure. Try it if you can get hands on SnCl2.