I was in the same boat as you not so long ago, and when my stock piece arrived I was still considering attempting to go the "triangle" route.
After seeing the amazing quality of the piece, and after throwing the entire topper on OVER my existing hair, I realized that with the help of a hairpiece I could achieve "better hair" than I've ever had in my life, by slightly lowering my entire hairline.
I also noticed that, in comparison to the piece, even the hair I still had on top of my head was quite thin, so I could tell that blending would be difficult, and the difficulty would only increase as I continue balding.
So in my personal opinion, I think it's both easier and better appearance wise to just go the "boomerang" route. I should take a picture of my piece when it's off of my head sometime and post it.