I doubt this will help. If you send every Nth message from a stram of messages, the time they arrive at the device will still be the same, your CPU will remove the messages at the sppeed of the CPU, and still deliver them as fast as it can.
So sending 99 messages and sending 59 messages and sending 30 messages will cause them to arrive at same intervals, won’t that affect the Yamaha anyway ?
Is the amount a problem or is it the amount in a short time the problem ?