You'll all get on fine!

If I can do it on a 37 y.o.bike, solo and in February and with lots of enthusiasm then anyone can. [emoji41][emoji41][emoji41]!

Search Touratech ACT. They put their name to 2 other routes, one in Greece and one in Romania, which I plan on doing soon!
I believe some of it crosses/uses the TET.

I didn't see a single bike on the tracks. Cold at night maybe 15C in the day.

I did it on my old BMW..... In February 2018.

Easy 5 day trip North to South. It's suitable for any bike...I had no rain though.

Didn't camp but there's plenty of accom nearby. The route is mostly along the Spanish border.

Glynn

Ive done the Portugal route.
Excellent! Did it on my old 1981 G/S in February 2018.
5 simple days north to south.
Used a Zumo 660.....the sat nav takes a bit of getting used to reading it.