If you are using Reaper you could use JSFX Spectrum Matcher.
It would analyses your current recorded vocal's timbre and then apply EQ etc. to correct the your pitch shifted one.
It'd take some experimenting and tweaking but should restore at least some of the tone you're after.
You can find the VST/Plugin in the Reaper stash and there're a couple of videos on Utub to assist.

Cheers
rayc
"What's so funny about peace, love & understanding?" - N.Lowe