After all this time I looked at Elephone's forums and it has a surprisingly active and resourcesful community, which actually created many different custom roms for the phone. I installed one of them based on AOSP 5.1.1 and it successfully reestablishes encryption while maintaining performance. There is also Cyanogenmod.
Too bad that their build quality can be shaky. Usually when getting a Chinese phone it is very hard to get software support but Elephone (and OnePlus) seem to be the shining exceptions.
Other than that Elephone's phone are pretty cool.
I've been looking at this, it is the Innos D6000. It is the smartphone with the best battery life known so far and it is very solidly built. In fact it has two batteries, one internal, and one external. The phone will first use the external battery and will resort to the internal one if the external one becomes empty, so its capacity can be maintained and the external battery can be replaced when it become to weak.
I decided to order it because I am tired of weak battery lives, my Oneplus Two barely lasts more than 3 hours of screen on time while using the Internet. This will be at least three times as good. The Oneplus Two kept having its battery drained while I was on a flight over the Pacific. This one should last all the way, and while I wait for hours at the airport too!
Definitely the Chinese are starting to make quite ingenious products that answer to their users' needs in ways which other manufacturers don't.