I've been with TKC80 on Iceland and ride K60 on the GS1150 since then. A few months ago I took a 650 with Desserts to Morocco.

Morocco in spring time can be wet at time and I don't know of any tire which lasts 8000km and is good on mud. For the distance and acceptable performance both on and off road the TKC80 and the K60 will be ok. I'd prefer the TKC, hoping that it might offer a bit more grip at the front on dirt.
The K60 is nice on the road, although on my bike there's quite a bit of noise around 100 to 120km/h. Still much quieter than the TKC.

This is no option for M1Tanker as it's only available in 21"/18", but almost anyone who participated in the Paris Dakar before 2008 does have that experience - which speaks for itself.
I used them in southern Morocco and they were great. But be aware that these tires are dangerously slippy on wet tarmac! Wheelspin in 3rd gear at half throttle is not unusual. The front feels very unstable on asphalt - go easy with the air pressure to improve that a bit.
Regarding mousses I'd think they're a bit overkill for this. Not worth the hassle if you ask me. Just bring a spare tube, tire irons and a hand pump - and take it as part of the adventure if you have to use them. ( I doubt it.)
By the way, 2000km will barely bring you from Tanger to Zagora - I presume it will be more than 3000km for you at the end.

Edit: (from here)
Have fun!

Pip