That would be an excellent addition to the Alt-F list of supported devices, but it is currently not supported.
It shouldn't be too difficult to port Alt-F to the DNS-345L, as it seems to be very similar to the DNS-327L, and D-Link reuses some of its electronic boards (the DNS-320-rev-B has the same electronic board as the DNS-320L-rev-A).
For initial development, and eventual unbricking, a serial to USB adapter needs to be soldered in the box, and that will void your warranty.
Then, linux knowledge, try and error and perseverance is needed to accomplish the task.
As I have not such box, it is not feasible for me to do it. Do you have linux expertise?