Is it the OP is being seconded by the company i.e. asked for OP to move to HK ? If that is the case, then they see value in the employee and should pay for all costs of relocation.
However, if it is the OP who is asking to move on his / her own initiative, then I don't see why the company should pay for quarantine and living conditions, if they have to carve out a role for OP in the HK office.
Maybe OP is sick of being locked down in Singapore and just wants a change of scenery. If OP is single, it's fine and not having to worry about schooling. Come to HK for the experience, you'll love it, you'll hate it, but you would have done it.