I know about, and respect, your live streaming needs, but most of us don't have such high bars, so these are uncharted waters. The HK SIM route is probably a better bet for you than A (iirc it let you down last time), especially since you do most of your streaming outside (i.e. have a good 5G connection). Please keep us posted. We will certainly help you optimize your strategy to the best of our abilities.

ETA: For the sake of STS's mission, can any of you guys comment on which specific HK SIMs are best? There are three sub-components to this question: a) Unicom, Telecom, Mobile; b) amount of throttling; c) indoor connectivity.

The only HK SIMs I've used are connected to Mobile, and they work fine for my needs (low bar, as previously mentioned)...and, you definitely want Mobile if you're traveling in third tier cities. However, Unicom has far more advanced network tech. I haven't used Telecom in quite a while, but some of my friends (also with low bars) are happy with it. WRT indoor connectivity, Mobile definitely wins (v Unicom), but you need to be in a pretty bad location for Unicom to seriously let you down.

Back on topic, if you were in HK, and wanted a SIM that would allow you to do fast, interactive, unbroken live streams in SH, what SIM would you choose?