I performed a search on Youtube for relevant videos for the outer glass. Most results showed the replacement of the full LCD assembly. I cross referenced the release date of the E7 with the S6, which showed they were released two months apart. If the manufacturing process is similar then the procedure/technique should be consistent for both phones.
I did find the Front Outer Lens Glass Screen on Amazon, so I ran the search on Youtube for the S6 instead.
I reviewed, Samsung Galaxy S6 Disassembly - Glass Removal - Glass Only Replacement, which should be similar for the E7. Additionally, I thought, Galaxy S4 JUST THE GLASS Screen Repair BEST Video was also helpful, though it is for the S4, which was released two years earlier than the S6 and E7. The technique and correct tools used is what makes the removal process successful.
With the availability of the part to change the glass, it should be possible, but please take into consideration that since there is limited documentation, the possibility of the adhesive being stronger, as stated above, may also be possible as well.
If you decide to use these videos mentioned as a guide, perhaps, you could record the process with video or images to provide documentation for this model for others who may have the same desire.