For guys who want to try Leste (and eventually help to port some apps or fix some bugs), there is now a new (and amazing) way to install Leste on any Android phone (no rooted device needed, minimum Android 8):
Diejuse found a way to modify a Leste raspberry pi3 image and run it using PRoot (pseudo root).
That's highly experimental at the moment but most Maemo Leste features are already working. (i'm writing this post using Leste on a Redmi Note 12).

It's quite easy to install directly from Android.

Here is Diejuse github link with all the process :

https://github.com/diejuse/proot_MaemoLeste_on_Android