Creating executable device nodes in /dev?

Hi udev people-

The upcoming Linux SGX driver has a device node /dev/sgx.  User code
opens it, does various setup things, mmaps it, and needs to be able to
create PROT_EXEC mappings.  This gets quite awkward if /dev is mounted
noexec.

Can udev arrange to make a device node executable on distros that make
/dev noexec?  This could be done by bind-mounting from an exec tmpfs.
Alternatively, the kernel could probably learn to ignore noexec on
/dev/sgx, but that seems a little bit evil.

Thanks,
Andy