Well it is just that I am a huge fan of the RT3200, which I think is the most exciting new basic consumer router for OpenWrt right now. Big user base and very active development. Includes recent WiFi AX technology.
Then for your analogue phone you could use the HT801, which is well reviewed. My feeling is get a premium OpenWrt capable router product with good specifications, and rely on a separate device to give you the RJ11 VOIP capability.
I imagine that if you try to get an OpenWrt capable device that includes the analogue phone capability it will either be impossible or a compromise in terms of specifications. So better to focus on getting something that is good for the core functionality (router) and then just use separate device to give the RJ11/VOIP capability. Rather than compromising the core functionality (router) just to get an all in one device.
Make sense?
I think with the HT801 you can just plug in an analogue phone and it gives a normal ethernet output that you could then just plug into your RT3200.