Think about it... you're lunging yourself at them, full force, with your shield raised high. Sure, it won't stun them, but it'll definitely help to even off the playing field a bit.
I find the barrier annoying with to begin with, and even in a full party of four people, if someone doesn't aggro against the barrier (or can't currently), then all the Gremlins have to do is just wait for their health to regenerate and heal everything else (or worse, spawn a healing rune directly over them), leading to more problems.
Of course, for this case, the Tortodrone shields will be able to break the barrier, as well as land an additional hit from the shield bash, since it does "double shield bash damage."
I see what you're getting at but I think it is unnecessary. Honestly, especially with several days of the apocrean event past us by now, you should have a poison weapon to use when confronting gremlins.
Poison is the best thing ever when menders are around.