Travelling to Japan via Shanghai

Hi,

I'm travelling from London to Osaka (Japan) via Shanghai.
I believe I'm eligible for the 144-hour visa exemption; but worried I won't have enough time in between flights to cover the application process?
My stopover on my way to Japan is only 2 hours at Shanghai!
I've also tried applying online, but as I'm not staying at a Shanghai address, cannot fill out the online application form. No idea what to do, so any guidance is helpful!

Thanks!