Wow, Ramchu. That's one nice looking printer. I can see why you were drawn to it.
Maybe I can help just a little ...
First, I followed the link to your first post about the printer driver. It appears that it's just a print driver, from what I can tell (didn't install it since I don't have that printer).
Then, I went to the Support section
of the Epson website. When I entered the MF-3540 model number, I got this message:
I then went looking for the manual/user guide
for the MF-3540. Inside it, I found this:
So, while it appears that the scanner portion of your All-In-One isn't directly supported, it does appear that you can definitely scan to a memory card, and even possibly scan to the "cloud." The last 3 options don't, however, appear to be available to you from your PC without having driver support. If you scan to memory card, you could then move the memory card from the scanner to your PC and read the files that way. Not ideal, but definitely workable.
It looks like Epson has made the scanner TWAIN compliant, instead of SANE compliant, and Linux support for TWAIN devices is spotty at best. While SANE is a public domain, openly developed backend to communicate with imaging devices and is released under the GNU General Public License, TWAIN is a closed source "solution" backed by and lead by a conglomeration of those device manufacturers. Back in 2008 or 2009, there was talk of including Linux support in the TWAIN releases, and there was some progress made at that time. However, there is no mention since then of any significant Linux support. There have been some efforts to get TWAIN devices working under Linux (SANE support for TWAIN devices is spotty at best). There is the ScanTWAIN
SourceForge project, but I don't know helpful this will be for your situation.
I hope some of this has been helpful.