Default [Q] Remote access to files, emulated as SDcard?

Hi guys,

first off, if this is the wrong place for my post, please move it =)

My problem is as follows:

I have a embedded device running Android, that is being programmed using a SD card. For testing and development purposes, it is quite uncomfortable to utilize a SD card everytime.
What I would need, is a hardware/software combination to emulate a physical SD card and access files stored remotely on the LAN. WiFi, as well as Bluetotth and NFC are no options because I have several sensitive processes that may interfere or be interfered when WiFi is used.

My question is:
Does anybody know if such an adapter (LAN to SDcard) and/or software solution exists, and could that somebody please kindly point me in the right direction?
If anyone can hint me at a solution, that would be very cool.

Thanks in advance,

Chris