Captive portal logins for granting access to Youtube

[Raine]

Let me ask if Captive portal/logins could be used with granting more access rights to forbidden content, such as Youtube?
I would like to use this in local lan environment (not in guest network) where users do not login normally. But when user needs to access restricted parts of the network, such as Youtube, user could login with voucher on Captive portal and be granted for 30 minutes of YT access.

Typical scenario is in schools (and nowadays home schooling) where kids would spend all their energy with YT and therefore need to restrict during school hours. But in other hand, in some classes, YT is used in teaching. A voucher scheme for approving such temporary accesses would be nice.

Is this possible, or is it just me wondering something that makes no sense? Or is there even better and easier ways to solve this?

All the tips how solve this are highly appreciated!

Many thanks, stay safe!
Raine