Increasing Mavlink message rate to 100hz

I'm using ArduPilot solely as an AHRS/INS, and I need to send MavLink telemetry updates at at least 100hz to another process on the same system. My streams of interest (SR1_EXTRA1, SR1_EXTRA3, probably more later) appear to be limited to 10hz. Before I cook up some looney BS like writing the data to a filesystem socket in the UserCode loop, I'd like to see if I can get things flowing through the UDP telemetry (albeit to localhost) - it's already there and I'll have recompile-free access to things I don't know I want yet.

I'm more than happy to fork code and/or disable all message validations, if that's what it comes down to... just need to know where to look :)

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