Hello Benoit
Yes, it is an EXTREMELY UGLY HACK.
Just set up netgear.com on our cache DNSes. I see the client's request for time-g.netgear.com is now being replied with 157.161.1.4 (our NTP server), but those clients still are not happy and keep sending up to hundreds of request/s.
Well, bad luck with this hack then. :-(
Apparently this was already pointed out by Beat Bodenmann shortly after my mail.