I have no idea what age your children are, but just to add a little perspective. Tthere are many here (and noticeably more as time passes) that feel that HK does not offer the greatest education. I have no direct experience of the German Swisss School to be fair, but know ESF system very well and Australian International school reasonably well. Remember those ESF non competitive sports days?
It certainly doesn't work for many, but with the environmental issues in HKG and general lack of decent outdoor sporting facilitlies, many of us have elected the expensive and, for
some, the emotionally challenging boading school option.
Not too sure what the deal is re fee assistance for new expat entrants these days, but all my kids wanted out of the HK system
and now board. All are flourishing and (I believe) enjoy their Hong Kong visits all the more for not being here full time.
Very personal and an emotive topic but is IS an option providing
all are on side and the sums work.