I wouldn't have a problem just cutting out the grille if that's what you wanted to do.
He recommended CYA glue to re-install the grille which I would Not do.
I would find a more suitable adhesive myself...
I see CYA glue on a vertical surface as turning into a mess rather quickly.
But if you're hesitant simply because it's going into an unknown, I'll clear that up for you.
There are 5 screws to remove, then the rest pops off.
Two are 10mm hex head bolts from the top down in those little cubbyholes.
One is a 14mm bolt for the seat belt.
Then you have to pull the carpet back a few inches to expose two phillips head screws holding it to the floor.
If you look at my pic up close, you'll see two white square plastic pieces right in front of the wheel well on the floor.
Those are where the phillips head screws are located and they are under the carpet, which is why you have to pull the carpet away to get to them.
Then, the rest pops out.
The only difficulty, really, when re-installing, is the white plastic insert at the very front nose, in front of the seat belt bolt hole.
That's a bit difficult to get back in place with the seats already installed.
But not impossible, just slightly more difficult.