I worcester wont' shred the mouth as it has no contact with it

I had one on rosie for a while, but found it really difficult to fit to her properly
You could consider a wilkie type bit? Very popular in the show ring for the very reason you have stated with your daughter and pony. You can still have the french link mouth piece (which isn't as harsh and shouldn't be causing as much pain as you've been led to believe

)