oh ok, i misunderstood.
I tried this earlier but as I suspected it didn't work. You don't need 2 accounts for that, I've my bulbs on Singapore locale via yeelight app, and other products on China locale via Mi app.
Looks like if I have China locale, and I share my device with someone (my other account) with Singapore locale, it doesn't work. Sharing only works within same locale from that I gathered.
I only moved 1 of my bulbs to China locale, and I didn't experience any latency. As I've other sensors, I might move my bulbs to China locale.