Sold. And Funnily enough I was just looking at DMR pedals. I've always run them and was planning on grabbing a pair for her too.
Sorry, I tend to make leaps in my own mind and don't always consider that other people might not take the same route...
If you are wanting your kids to go onto 5.10s, then 110% go with a cupsole style kids shoe. 5.10s are a cupsole as well. I am an adult, but more often than not I buy kids shoes. Given the choice of shoes in my size that are also for adults AND riding is about....well, 5.10 or Shimano...I've pretty much always has a vulcanized shoe, almost always Vans. I love Vans, the pedal feel and grip is so much better than 5.10 or any "mtb shoe" IMPO. But because I've grown so accustomed to a flexible Vulc shoe, I pretty much can't run a cupsole without getting angry at my lack of pedal feel. I hate 5.10s, had my worst ever stack in them due to my lighter weight not being able to bend the sole combined with the lack of pedal feel (both feet bounced off just before a jump on a trail, it was not fun).
As for the V6, it's the same profile as the V12. I wouldn't even consider graduating to a metal pedal the V6 is so boss. But then it will have the advantage of being a familiar shape and feel.
Anyway, good luck.