This worked perfectly for me! Sounds like a lot of steps, but really it only took 3 seconds–I used an adjustment layer as my dummy footage.
As for those wondering why we edit this way–I like to drag all of my B Roll into the timeline, cut the pieces I like, then slide the unused B Roll further down the timeline. Once I do this, I ripple delete all of my selected B Roll while leaving the gaps in the unused B Roll.
If I need more B Roll later, I can easily see what I’ve already used by seeing the gaps in the leftover footage.
Thanks again for the help!