Would these routes qualify for 144-hr visa?

I'm trying to organise a business trip and have the following flight plans to research:

UK - Tokyo (with potentially a 2 hour layover in Shanghai on way to Tokyo) - Seoul - Shanghai - UK

UK - Tokyo (with potentially a 2 hour layover in Shanghai on way to Tokyo)- Shanghai - UK

UK - Tokyo (with potentially a 2 hour layover in Shanghai on way to Tokyo) - Seoul - Shanghai - UK

Oslo - Tokyo (with a 3 hour layover in Doha, Qatar) - Seoul - Shanghai - Oslo (with a layover in Doha, Qatar)

Singapore - Tokyo - Seoul - Shanghai - Singapore

Would these fit the 144-hour transit visa?

For the option that the flight to Tokyo has a 3 hour layover in Shanghai - would this mean the 144-hour starts when they land in Shanghai for the layover?

Many thanks