would it be possible to use the Arduino IDE ( for Arduino DUE ) to compile the code for the LPC810 ?
Not as it is, I think you would have to add your own variant file and core libraries but that's not an area I'm very familiar with.
@Bob/Chris, is it worth trying to develop an LPC Arduino port that will support several versions of LPC? It's certainly been an interest of mine but TBH I'm probably more HW than SW. I can certainly write code (was employed to do so for many years) but it's the toolchain stuff and organisation of files to allow all different CPUs that I struggle with.
Rob