I dont think you can put the sdk on the device and compile though, unless someting has changed and I missed it?
There is no way to run scratchbox on the n810, but you can install the entire development toolchain. You might want to start with KDE (also consider an n800 with 16Gb SD card). There should be pointers around the fora, but there are complete native toolchains for the tablets. I haven't gotten around to installing them.