That's unfortunate. I thought since you could use Maestro companion switches (e.g. MA-AS) in 3 and 4-way applications that they would work here. This might seem silly, but aesthetically I don't think any toggle or paddle switch will look good when mixed with Caseta switches since they wouldn't be flat/flush against the fall like the Caseta switches.
Is the only other option to replace the switch with a Pico?