Any thoughts on if it will be OK to transfer in HKG come January 2022 with separate tickets. I believe right now the rule is....

Per below it seems you currently have to have a single ticket. The checked through bag rule is also an issue but in my case I could fly with no checked bags.Transit/ Transfer Services Resume Gradually from June 2020

Air transit/transfer services at Hong Kong International Airport (HKIA) have resumed gradually. From 15 June 2020, passengers can use HKIA for transit/transfer on flights operated by different airlines under the same air ticket, provided that the passengers have checked through at the origin port with their boarding passes printed and baggage tagged-through to the final destination. Passengers should also confirm in advance that they are able to enter the final destination. Please check with airlines for details.