Some additional information would be helpful such as which Sony body, will you be using a tripod, and what is your budget. As someone whose majority of work over the years is architectural, first with large format and later with Sony, I agree with Rico, mcbroomf, and Jack Flesher that you can fix the majority of perspectival issues in post.
It's not clear what you are looking for in a T/S lens. For national parks, I imagine that you are really looking for lens shift rather than tilt. The easiest solution would be to get either the Canon or Nikon T/S lens, but the best versions are still pricy. Another option would be to go a little wider and consider the Laowa 20mm shift-only lens. There's a review over on Phillip Reeves site. An adapted medium format lens is also a good option, but I'm not aware of any 24mm only 28mm lenses (645) and they also get quite pricey.
Personally, I haven't found the need for T/S to do my work, but I did pick up a TTArtisans 17mm T/S when it first came out. It's wider than you want, but optically it's better than its price point. Mechanically, its not as good as the optics but for the price point it's a great value and option.
If you are set on 24/25mm then I would purchase the latest version Canon lens you can afford.