In most cases I'd probably switch to different filters in that time, so I could (and probably should) refocus after each change. And dew heater control can be a different solution if I really need it - I have not had many issues in the past with the RC10. I have no idea if a refractor will react differently.
Another option I'm checking out is the JMI Motofocus (
http://www.jmitelescopes.com/)