I believe that you can do this if you add a power-on delay of 4-5 seconds to your tv device in the Harmony software. That way the remote will wait 4-5 seconds before sending the next command. You may need to add a start up 'dummy' command to the TV in between in order for the 4-5 seconds to happen before the AVR turns on.
Let me know if you want to try this and if you need step-by-step instructions.
Happy New Year,
RC