OpenWrt on Netgear Prosafe FVS338 vpn firewall

I just got my hands on a netgear FVS338 Firewall. I immediately thought about installing OpenWrt, since the stock firmware is not supported anymore. After some research I found this forum article. And this one too, after my understanding the Firewall uses the Intel Xscale architecture which seems to be supported by OpenWrt.
So my question now: Is it possible to run OpenWrt on that Firewall or would the work assosiated with it not be worth it?

Seems it would require a v6 or latest v5 Linux kernel.

And OpenWrt doesn't use that Version of the Kernel?

I think master's on v6, the current releases doesn't.