From what I've seen for the past 2-3 years without owning any of these new Chinese handhelds, sounds physically impossible.
I have to disclaim that, and that my last handheld of any kind I still have is the NDSL.
Being pants pocketable seems to always be a compromise on ergonomics to be in a certain size and form factor.
Also if you did not already know, you can browse retrocatalog.com for specs and size comparisons. E.g. size comparison between the miniloong pocket 1 and magicx one 35.
Then I use both https://shauninman.com/utils/screens/ and https://a9udn9u.github.io/blackbars/ forfurther screen size and asp3ct ratio comparisons. The former has an option to show interger scaling and both can unptu custom screen size and resolution if the handheld you want to look at isn't in their site.