Yes. eSIMAdvice currently lists 10 Ohayu Hong Kong plans.
The lowest displayed Ohayu Hong Kong plan is Hong Kong · 2 GB · 7 days · 5G, at $5.39.
Hong Kong · 50 GB · 30 days · 5G is the current best-value match by displayed price per GB: $1.09/GB ($54.44 in total).
Yes. Eligible displayed prices already include the active ESIMADVICE coupon where the provider rule applies.