Sub account or dedicated kids account#806

Could you please implement a way to buy and hold cryptos on a sub account (or allow to create a dedicated kid account, from 0 to 18y).
With my wife we have one SB account each and we want to DCA BTC for our new born kid.
Currently support said it’s not possible and the only solution I found it’s to create another account on my name on another platform…
Thank you for your understanding

I see it this way: a parent opens an account for a child using their passport and signs that the funds in this account will belong to the child when they turn 18 and pass KYC verification. Until then, the account can only accept crypto deposits from parents account without the possibility of withdrawal. Access to the account would be from a tab on the parent’s account (or/and simple kids app) and would be read-only without the possibility of making transactions on the child’s account. Once a year, a letter addressed to the child would be send home with information about the balance.

Is that possible?
my kids have savings accounts (3%) in the bank and they will get those funds when they grow up. honestly I would rather save up BTC for them