One thing I see on your Morocco blue route is Foum Zguid towards Tagounite: a piste from hell once you are off the over-rated Iriki section. Just over the jebel to the north is a road to Zagora. Or a very nice ride north from Foum: turn off for MS13, a nice quiet ride to Agdz with an easy piste stage. And from there a short ride to the next bit.

Much more fun/relaxing to keep off main N roads wherever possible. Down south you won't have a choice.

Then your blue continuation north off the R108 over Jebel Sarhro West (MH15 in my book) will give your spokes something to think about and is actually better southbound (gradual up; steep down). Will take a couple of days and a lot of pushing. Very nice piste, but the more-used MH4 out of Nekob could be easier as it’s getting sealed but is also spectacular.
The stage from Imilchil to Ahansal and beyond will be tough but enjoyable. And from Beni Mellal, scenically the fun bit is over as you probably guessed.

A nice southern detour off your red route is from Tinerhir up to Iknioun and then back down to Dades. All sealed and will avoid the fast traffic on the busy N10 if you are not in a hurry. N10 Dades to Ozt will be a slog.
The road west from Agouim N9 is all sealed until the turn off to the lake.
Don’t know the approach around Toubkal beyond the lake, but I suspect a lot of pushing or even carrying.

If you do half of what you have planned in Morocco I will be exceedingly surprised ;-) but a plan has to start somewhere. What you have here is a whole separate adventure – doing Mauritania is another. Maybe leave the hardcore exploring of Mk for the way back if you have any energy/health left and when it's cooler.
Be warned the northern section towards Fez is very hilly. I would even consider getting a train Tangier to Marrakech to get straight to the action - or vice versa to cut out the relatively boring north.

The inland bit from Afkhenir, I think is mostly desolate piste; i would not risk it alone (a road goes towards the R101 Abteh I believe, but I did not see it last year).
Nice backroute from Tarfaya along the coast to Foum el Oued west of Layounne.

Price of private lifts: don't know but whatever they can get away with deepening how desperate you look. Might even be nothing. Agree before getting in.

RIM
The southern route you show from Ching to Ouadane - no chance on a bicycle. It is the northern rubble track or nothing. Personally I think Ouadane is fascinating to look at but not been there for 20 years. It might eat 3-4 days out of your time.
Not done it, but the Mhaireth loop should be fun without being way out there.

Bike looks good, nice copper accents. A mate just did NZ end-to-end on something similar except it is probably 20-30 years newer and 10 x the value ;-) Like him, I would spec a fork for hydraulic disc brakes so you can have much stronger rims which won't get ground away by the brakes. And then the next size tyre up for a bit of suspension on the pistes. For WS road, pump up to 3-4 bar in a garage and hope for a backwind.
Centralise the weight by filling that triangle with weight, bikepacking-style not classic 4-pan style. Will handle much better on the pistes. Get weight off the back rack which often give problems (actually I see it is axle mounted - better).
I think that lower bottle cage will bend open if used on the piste without a strap.
Better still to get the big cages to take your typical 1.5L plastic mineral water bottles sold locally.
I would consider changing your valves for Schrader so you can top up anywhere/off a lorry with a hose when you lose your pump or it fills with sand (better to keep it inside a bag in the desert). Good thing with Schwalbe is that punctures are exceedingly rare.

This book might be interesting and appears to be all online or used and cheap on amazon. I seem to recall he went a little bit crazy in the desert but in '88 it was a tough old ride.