I'm excited to hear about this WW. I took the same tack with my boys when they were little. I started out by strumming an acoustic sitting around with them and teaching them to sing folk tunes from the great American song book, i.e., Turkey in the Straw, On Top of Old Smokey, Froggy Went a Courtin', Polly Wolly Doodle, etc. It was sooooo much fun. I really just wanted them to get accustomed to being immersed in music of all kinds and to not be afraid to sing out loud to grabbing any instrument and giving it a shot.
We also let them dabble in all kinds music lessons but never forced them. I didn't want to be that parent. If they needed a break, that was okay. What I feel is most helpful was to surround them with beater but playable instruments they can mess with at any time. I bought rough starter drum kit close their size, a cheapie keyboard and amp, and a beater bass and guitar. They picked them up all them time. One thing I didn't do was give them was full access to my record collection and my fancy turntable. In hindsight, maybe I should have. Most kids access music via youtube nowadays, though.
I would say we were pretty successful. My youngest is completely consumed by music and has become quite the accomplished piano player and drummer. The other also plays drums, guitar, and bass but not as actively. I think appreciation for music is one of the greatest gifts I can give my kids, and they both have that in droves.
As far as getting another D-25 is concerned, I think the Guild pair can be Mom and Pops special instruments they can learn to respect and play carefully.
Looking forward to hearing about your progress with this, and I hope you grab the arch back. :C)