Subscribe By Email - more than one feed, including CPT

Hi-

I've set up my clients' site to have two feeds, one for their blog and one for their podcast episodes. I am using a custom post type + PowerPress for the podcast.

I would like to offer users the opportunity to subscribe to each feed via email (as well as good ol' fashioned RSS.)

The Subscribe by Email only seems to be usable on one feed - the site's main feed. Is there a way I can tweak it to handle two feeds? Perhaps clone the plug-in and change some bits?

I'd welcome any non-plugin suggestions too. My only caveat is that I don't want to use Feedburner.

Mucho Gracias,
Kim