Yes, that will work.

A user outside scratchbox environment means a working user account on the Linux system. Usually, that means the non-root account you're using. Your current account you're logged into on the Linux system is probably suitable.

PS: the Maemo SDK documentation on wiki has been updated with clarifications regarding Linux x86-64 and disabling VDSO32. It should be easier with sysctl than editting bootloader such as GRUB(2).