I chose SFO-YVR because I'd like a free layover to visit YVR, thus, the 2-3 day layover. I can do without YVR. IF I stick with AA redemption, Is it possible for stops in from SFO-HKG- NRT- Sin or Taiwan on CX?

If my intinerary eliminates YVR and DPS would it be possible to visit HKG-NRT and Sin or Taiwan with only CX?

I'm not sure if SFO-HKG-Sin or Taiwan
Sin or Taiwan-HKG-NRT-SFO would work.