Here's my take on the Guanche, after spending an hour or so reading about them (advantages of knowing spanish):
Guanche - Tinerfe
UA: Beñesmer: Cities reveal a source of Dogs* upon foundation. During WLTKD, Worked Camps & Pastures produce +1 Culture for the city.
UU: Ancor: Replaces Archer. Costs less production and can acquire Promotions from the Scout line. Scouts can also be upgraded to Ancors.
UB: Efequen: Replaces Temple. +2 Faith. Excess Food upon birth of a new citizen is transformed into Faith.
* Dog. +2 Food. Contributes 10% towards the production of land units when worked. + 1 Gold with a Camp.
As you may, or may not, have read, the Canary Islands were named that way not due to the little songbirds that carry that name, but for the large amount of dogs found on the Isles! (or so the leyend goes). Regardless of the veracity of this trivia fact, the truth is that the Canary peoples were largelly pastoral and they did in fact have dogs, both for eating and to help them in their pastoral endeavours, given how central these animals were to their lifestyle, I thought they deserved a part in this civilization.
Beñesmer, on the other hand, refers to the most important festival to the Ancient Guanche people, given how you were going for a WLTKD focus for the civ and a growth theme in general, I thought that combining that with the Pastoral civ idea I had would make sense, and a culture bonus coming from there would certainly make a lot of sense that way.
Ancor is the Tenerifean word for Warrior, from what I read the Guanche were known for their agility in traversing the rugged terrain of their Island, while also the fact that they kinda had a lack of complex materials for their weapons, so Stone Throwers it is with incredible flexibility, in theory the promotions should stay on upgrade, giving you some really good and versatile harrasers as long as you build many archers early game (or start upgrading from Scouts, up to you!). I suggest importing
this model for the unit.
Finally Efequen, not much to say here, it's a type of traditional Temple in the Canaries where food offerings were left for the deities, given all the food focus of this civ, something that benefited for overflow food would make sense.
And that's the civ, maybe some extra help for generating WLTKDs would be welcome, but I think this is a pretty decent idea, from my POV anyways.