Channlluv. I agree with a lot of folks, if you change it that much it's just not worth it.
You can make it a little healthier: Switch the flour for Spelt whole grain flour. It's an original grain (unlike whole wheat) and hasn't been genetically modified. Also bakes, one for one, the same as what your used to. It's all I use.
The sugar for organic unbleached turbinado. It's wonderfully rich in taste.
And the shortning for an un-hydroginated organic version. NO crisco!
All can be found at your local health food store.
It will not be less fatning, but it will be wonderful (in moderation). Wish I was there for a slice.