I think Yorkie should cut down and customise the piece he has to cover just the front area.
It will get him used to wearing,
it will look better and more consistent than his natural hairline
He won't have to worry about the piece shedding at the back or sides or rubbing on pillows.
His natural hair is in great shape and density to make integration/blend very easy
He'll save on glues and tapes
And after a short while of wearing, he'd know if he needed to make minor tweaks to his next order, which as John says, will come in time for when Yorkie wanted it.

Yorkie, I think you've ultimately found a better solution for your needs than your original idea was.
The area you've marked is the perfect area to wear a partial.
I believe you've actually made your wearing life easier for yourself doing it this way.