The kernel version is high enough to support the new generic 80211 wifi stack. It should be possible to run hostapd with driver=nl80211 as long as the latest compat-wifi backported wifi drivers are compiled in as a module (this means inception/openmode).

This is on my todo list, but I'm hella busy, so if you can interest somebody who can/has compiled their own kernels for the n9 then they'd probably be able to get this going quite quickly if this is possible.

Then there is NAT and being a dhcp daemon. NAT is also a module and thus a bit of a pain, in fact it might not even be possible as a straight module as I believe it needs a specifically chosen kernel option baked in, meaning openmode only. It's also not 100% necessary as almost all devices support using a proxy and you could install one in userspace along with dhcp daemon, both of which are trivial.