I don't know anything about those, but I'm not sold on the IEM style for kids, as they're still growing, ears may change, tips can get lost, etc.
The Steelseries Arctis 3 with Bluetooth is the typical go-to for Switch, b/c it can do wired to switch, and BT to phone, which you have to have if you're doing voice, which is not an elegant solution, but it's what you need to do since the Switch is limited on headphone connection options. https://www.amazon.com/dp/B07GTVK5W3/
A bit more than the Monoprice, but d-_-b
I"m sure Grahame is going to hop in and drop a link to the same along with 7 links expanding on what I said above within 3 minutes of this posting, so see that for more details.