My thoughts…
You’re not living to work, Ben, you’re working to live!
Priority in general: God -> Family -> Work -> Extended Family/Friends etc.
God means preference given to God’s authority in obeying/following God’s (Jesus’s) commandments.
Your pastoral duty, mission travel should be least of your worry. Paid or otherwise, they would go under work. To understand it, Reality check: Would you give up your music and music teaching for all these to be considered under God to give more priority over Family??
To be more efficient with your work, delegating with people trustworthy as you plan must be an excellent idea.
Cut as much time as you can on the less priority items and spend much time with your wife and precious kids. (I can never ever forget how my then 10-month old daughter missed me when I was out of town for a weekend, years ago. When I was back, she clung to me with a grip so tight for about 10-15 minutes and would not let me go.)
Success mantra: Build everything upon the rock - Jesus’ commandments!!