Solving a Small Problem with Diaper Covers

So we use mainly AI2 and fitteds for daytime diapering.  We like Grovia, Bestbottoms, and TrendLab and for fitteds we use Thirsties Fab fitted duos with Thirsties Covers (sized and duos).  Occasionally when my HUSBAND diapers them in the fitted we have some leakage, generally due to operator error when putting the cover on over the fitted, either at the leg holes or at the waist due to peek-through.  Here is an example of what I mean:

Every time this happens I ask myself,  "Well there must be a cover that has some sort of flap of the PUL that I can tuck up and over the fitted."  I am not talking about tuck-in flaps that you would use to insert flats or inserts into a cover. I am talking about a fly flap, kinda like what a tent has.  After a facebook query to my new FluffyBlogger friends (thanks ladies!) and poking around the internet and Etsy, I came to the conclusion that what I was seeking doesn't exist, at least not without it having to be custom-made.  (Not that I was able to find anyways so I APOLOGIZE in advance if anyone has made covers like this.)  Being a crafty lady I thought I could make a cover with some PUL I have out in the garage that was meant to make cloth diapers for the twins (yeah that happened, NOT!) but then I thought why don't I just modify an existing diaper cover.  So out came the sharp scissors and VOILA, I created what I had envisioned in my mind, a cover with a "fly flap."
Here I used a Large Thirsties sized cover with hook and loop and I simply cut the attachment of the tuck-in flap on both edges:

Now when I put the cover on I can literally tuck in the "fly flap" over the top of the fitted underneath to ensure no accidental bleed-though.  And because it's PUL I don't need to finish the edges or make any further modifications, although I haven't sent it through the wash yet so not sure how it will hold up.  Now the caveat of doing this is that you wreck the cover for resale if people want to use them for flats or inserts. In addition this won't work on the Thirsties Snap covers because the snaps go all the way through  flap layer. That's kinda a bummer because my kids are starting to take off hook and loop diapers.  Argh.  Well anyways that is my brilliant idea and I'd love to hear your thoughts.  (This million-dollar idea is for sale, just PM me. LOL)