If everything is static, you could just point (static default-route) everything to the next-hop in the chain, with the final router pointing to the firewall. It really depends on how large your network is and how it is designed, as to how many static routes you will need on each device, but your choices are limited when it comes to static routing.
For static routing, you don't have much choices anyways.
The point of considerations might be:
> Static Route with Next Hop
> Static Route with exit Interface
> Static route with with enhanced object tracking
> Load balancing - If multiple links are involved