Your plan is a good one. I would also recommend turning off the water heater, but don’t drain it. Even if there is a power outage it would take a very long time for it to freeze (longer than most outages)
It would also be a good idea to pour a little bit of RV antifreeze into all the sink and tub/shower traps in case of an outage. Open all cabinet doors with plumbing in them so they can absorb the heat of the home.
If possible, have the home checked on by a trusted neighbor or friend every week or so to make sure all is well. Other than that, you are doing more than most and we applaud you.