Why don't you add your partner to the express entry application? It might delay by a few weeks/months but at least both of you will get the PR. If you get the PR, the minimum wait time for partner sponsorship afterwards is 1 year (or even more due to COVID).
Did you live together? Did you share bills/common bank account? If yes, you might be able to prove your relationship. I would personally recommend adding your partner to your application now as it will reduce the wait in the long run. Consider getting professional help.
Also, since you are from HK - have you looked into the new HK visa? Your spouse could try getting that. More info here:
https://www.canada.ca/en/immigration-refugees-citizenship/news/2021/02/canada-launches-hong-kong-pathway-that-will-attract-recent-graduates-and-skilled-workers-with-faster-permanent-residency.html
I am in a similar situation and I haven't seen my spouse for a year now and I know its super hard.
Goodluck!