Thank you so much.You wrote this in a confusing way too, I am trying to understand this.
Based on this if you are PR since 2020 you should be elig, but also anytime as a protected person would be 0.5 to a total of 365 so based on the calculator you will be elig in 2023 May.
Also yes you can do that, but why don't you just send them all in paper, paper seems to be going faster anyways so why complicate it and do a separate application for yo kids n yo self but what ever works for you tbh