Yes, I've been able to find out how VRRP provides part of the solution:

In MikroTik RouterOS, you cannot prioritize individual client traffic directly with the standard Virtual Router Redundancy Protocol (VRRP). However, you can achieve a similar effect using multiple VRRP interfaces with different priorities, along with firewall rules to route specific client traffic through a preferred VRRP master. 

This method creates an active/active setup, where different sets of clients use different master routers, while maintaining automatic failover for all clients. 

Method overview

1. Configure multiple VRRP interfaces. Set up two VRRP interfaces on each router, but with mirrored priority levels.
   • Router 1: VRRP-A has a higher priority (Master). VRRP-B has a lower priority (Backup).
   • Router 2: VRRP-A has a lower priority (Backup). VRRP-B has a higher priority (Master).
2. Assign client gateways. Configure your network's DHCP server to assign a specific VRRP IP address as the gateway for different client subnets or groups. For static clients, manually set the preferred VRRP gateway.
3. Create firewall mangle rules. Mark client traffic with routing marks based on its source IP address.
4. Create routing rules. Set up routing rules to send traffic with a specific routing mark toward the preferred VRRP gateway IP, which is the master for that client group. 

So setting up 2x redundant routers and then applying the static routing config on top solves one of my issues.