You didn't really address the concerns. Putting a fake plant between the frog and the keeper doesn't actually keep the frog out. It's a fake plant, not a glass wall. Eventually he will realize they're there. Frankly it's just not a smart idea and if you do it long enough he's going to either get stressed once he realizes they're there or burrow under it and knock it over. There's a reason the more experienced keepers and breeders don't keep cricket keepers inside their frogs enclosures.

Why bother asking questions of more experienced keepers if you're going to go against every bit of advice given to you and do it anyway?