Password required for app updates on child’s account

My children under 13 have iPhones and they love to download apps. And I enjoy having the ability to review the apps before they download them but I got really tired of how many times I need to enter AppleID passwords to download a single game. It’s three times on my children’s phones of their own password and once on my phone with my password. So I decided to turn off the “ask to buy” feature. Now it is just that my children have to enter their password twice. But if they want to update an app they need to enter their password for every app that they want to update.

Is there anyway to decrease the number of times a password is needed?

I would really like to turn the “ask to buy” feature back on.

They do not use TouchID on their phones, ask to buy is currently off.

I can not turn off “require password” for free downloads and I cannot set the phone to wait 15 minutes to ask for the password again when downloading purchases. When I try to change those settings I get a message that say “you will be asked for a password for all downloads and purchases until you are over 13.”