Thank you very much for your answer!
Regarding terraces, I think I expressed myself incorrectly. We're limited by the town council planning, who have marked the land as Protected Landscape Space (Espacio de protección paisajística or EPP). From what I've seen town councils across the island tend to put this kind of protection to hilly areas in their municipality to prevent [some] high visual impact human activities on the slopes. One of the limitations included in EPPs are creating terraces, as well as and many other earthworks. Luckily, building water holding infrastructure is allowed. There are other important limitations, as well. However, laws are made for general cases, and these include traditional agriculture. Since we're aiming to establish a proper PC regenerative farm, our project is at the same time (according to town council ordinances) an ideal and limited candidate for activities in an EPP. Given the health of the land and bare soil, one would hardly think that's a protected landscape, especially with a medium-voltage tower sitting on top of the main hill :
We'll be able to work full time on the farm, and we have considered prioritizing a 1ha area to establish the core of our homestead during the initial years, in the flattest land spaces that conveniently sit halfway uphill. We'll be initially taking an easy approach on zones 4-5, which are 'forced' by slope and current accesses, and will have much of sitting, observing and letting be, except for the needed early actions to help it start rehealing.
Yes, you're right! The soil is definitely compacted where the dry thristles are, trampled for years. Thank you for your suggestions!