I can understand your situation. As you have time now, isn’t it possible for you to apply fo a US visa For them meanwhile?
Chances of waiving, I can not say much.
Its really 50-50 situation.
But getting a US visa would be a good option. And whats your application receive date? May be if its gonna take a while for you to receive bio request, probably by then they open bio collection centres in Canada but no one is sure about it.
They were saying that they will be opening some in Canada in 2019, and now on twitter they said they have plans to do it by the end of 2019, but you never know if they will really commit to that period. So i would suggest if you can get a US visa for them, get that so you will be more safe.
“Hi. We are aiming to have biometrics collection service in place by the end of 2019. More information will be available on our website at a later date so keep checking for updates.”
https://twitter.com/citimmcanada/status/1181636552851628032?s=21