Thanks for offering, but there isn't much users can do about it. Ultimately, it will depend on whether there's any way for Asus to provide me a way around this without having to break their licensing agreement with Broadcom and/or investing a significant amount of engineer time working on something that ultimately is only for a third party.
Asus's R&D probably already has their hands quite full with the recent WPA2 issues and something like 30-ish router models (plus all the wifi clients) in need of update, so it might take some time before I hear back from them one way or another.
At least I have a potential way around that I want to investigate in the coming days (splitting large nvram values into multiple small ones).