I don´t know, if it is really worth to spend such a lot of money for HON.
That depends on the benefit you get from the extra flights.
However, 2 years of HON for 5k EUR isn't such a bad deal. Just think of the extra eVouchers (which you don't need because you always get upgrades, anyway).
Plus, you could redeem part of it by "selling" the SEN partner status.
Actually, I already know somebody who might be interested in taking it.