Hy

I am thinking on building a more redundant home network My question would be as following.

As sincs my ISP doesnt allow multiple Cable modems, but allows 3 IPs to be assigned at one time. So the idea I got

                                       |------Router 1 (VRRP) Main   ----------Wifi-------------------|
-----Modem-------Switch----|                                                                                   == Repeater
                                       |------Router 2 (VRRP) Standby    -----Wifi-------------------|

Both routers would have a seperate wifi and if one fails the second would take over. As I investigated and learnt on BCMSN, VRRP cannot track interfaces and isnt able to switch over the wifi.

So comes the interesting part...1 room further there is going to be a Repeater, so signals can get to the bedroom better, cause sometimes I like to work from bed (I know I am a lazy bastard....)
My question following
If the repeater (of course all 3 running openwrt Kamikaze) has an Ap configured for the main, and a virtual AP configured for the Standby one, Is it possible to configure the Repeater to work for both AP'S on different Channels or do all 3 AP's need to be configured for the same channel?

Is there some better solution already out there on openwrt (VRRP) that I might have not heard of?

I know Modem and Switch are SPOF, but these are the steps where I can start on implementing redundancy.... I wish I could go with 2 modems but ISP wont allow it ..:(