Got to be honest:
Any delusions about Kalos are just out of touch with the reality of video game development, and that of this particular series.
Kalos has barely featured in any meaningful way since 2016. It's nearly a decade since X & Y came out. Even its third legendary was repurposed for the next generation with barely a mention of where it came from.
We are now three generations up from Kalos and its only meaningful contributions to the games - mega evolutions and sky battles - have been well and truly consigned to history (Pokémon Go excepted - and I am not convinced that mega evolutions will remain there).
France & Spain =/= Kalos & Paldea. Just because they based Gen 6's and Gen 9's region on them does not mean they will make them next to each other, any more than Hoen was just off the coast of Johto, or Unova was near Hoen, or Galar to Kalos...etc etc.
Each gen and each new main series game is always its own thing, with a new story, new Pokemon, and new influences, and even new team members working on it.
Sad as it may be for some to accept it, but Kalos will only appear in a remake, if at all. We are now up to the DS titles for remakes, BDSP haven't outsold Legends Arceus together, sales for which to the end of 2022 are projected to completely outstrip these remakes.
Legends Arceus is the first new different main series game and it could be that BDSP might represent the end of the line of the remade titles - who knows. But the practically "as is" nature of the remakes was not well received and arguably only PLA has affected the development of the franchise in a positive fashion.
Kalos is not going to be a meaningful part of S/V. Deal with it. Sorry.
About the remake situation. If you recall, one of the big reasons why FireRed and LeafGreen, followed by HeartGold and SoulSilver, were made in the first place was because the original Kanto and Johto games were uncompatible with Ruby and Sapphire onward, due to the revamp in the battle system in those games. FR/LG and HG/SS were made to implement the revamped battle system into those adventures, and it wouldn't be until Red, Blue, Yellow, Gold, Silver and Crystal were all re-released for 3DS Virtual Console in which they figured out how to get Pokemon caught in those titles reworked into later games with the revamped battle system, beginning with Sun and Moon.
I believe there is once again a reason as to why they been starting to remake games again in the form of OmegaRuby and AlphaSapphire in Gen. 6, Let's Go, Pikachu and Eevee in Gen. 7, and Brilliant Diamond and Shining Pearl in Gen. 8: Pokemon X and Y introduced the Fairy type, and like before with the revamped battle system, I think The Pokemon Company wants to implement the new type into the early adventures. So judging from this observation, I think we're gonna get new versions of the Johto games, as well as Unova remakes, both of which will implement the Fairy type, in the coming years.
As for whether Kalos remakes will come or not, I think it will depend on whether or not they implement some new game-changing feature, similar to the revamped battle system and the Fairy-type, into the games following the theoretical Unova remakes.
