This may already be a “hybrid” rudiment, but I wouldn't know, because that is not my bag. I've posted a few modified paradiddle things in the past (like my “3.5-adiddle”), and this is a new one I've been screwing around with, a seven-note pattern: RLRRLRR-LRLLRLL. Sort of a paradiddle... adiddle.
You can see that's the basic pattern, along with a few exercises for learning to play it repetitively, and learning to play it in duple meters. As indicated on the page, the accents in parentheses are optional— play them, don't play them, or play them lightly. For practical purposes, your initial goal should be to play them at quarter note = 120, and your eventual goal should be around 150+. They can be played faster, but then you're getting into “flurry of shit” mode.
Get the pdf