OSPF with two Router/Switch failover?

So been playing with how to accomplish a task based on no budget and "oh god this is config is so messy". This is involving my SIP voice network.

https://i.imgur.com/7cZveNk.jpg

I currently have SW1 and SW2 that are just basically hardware failover with full HSRP redundancy between the two. There is two /29's also between all of SW1-2 and R1-2. SW1-2 are nothing but static routes for two different ip sla tracks. If first track is up, send all traffic out the primary /29. If down, send out the secondary /29.

Every Router in the network also has an IP track for the primary IP of each /29, for if the first /29 goes down, go to the second /29.

I'm thinking ideally, I should replace SW1 and SW2 with something that can actually route, and keep the target IP the same between them with somehow failing over between. I was thinking of something like OSPF with L2/L3 trunk between and changing the AD on the secondary. That way if SW1 were to ever go fully down, HSRP would elect SW2 as the new .1, and it'd be the only valid route anyway from an L3 perspective.

Of course, budget is limited and I have two ASAs handling only very small chunks of public space but are whole chunky 5525's that I bet could work well for this LAN config w/ OSPF to exchange on my core as well.

Any thoughts would be great, since this would eliminate one more use case of default route in my network and make my voice network failover even smoother.