Community Tip - Learn all about PTC Community Badges. Engage with PTC and see how many you can earn! X
Sorry, no luck. Evidently not many people want to do this since there aren't many replies here.
PTC Technical Support answer:
"Unfortunately Creo Parametric does not support default font selection for sketch text at this stage.".
Please for for this Product Idea: http://communities.ptc.com/ideas/4329