How to achieve EC2 high availability while prefering the instance launch into a specific Availability Zone

I am looking for how to specify the zone I want to deploy to in a single instance deployment, with autoscaling, while also having automatic failover to another zone -- Do any options exist to achieve this?

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More context

Due to how reserved instances are linked to a single availability zone (AZ), we find it to be a good strategy (from an "ease of management"/simplicity perspective), when buying reserved instances for our dev environment, to buy them all in a single zone and then launch all dev instances in that single zone. (In production, we buy across zones and run with autoscale groups that specify to deploy across all zones).

I am looking for how to:

1. Specify the AZ that I want an instance to be deployed to, so that I can leverage the reserved instances that are tied to a single (and consistent) AZ.

while also having

2. The ability to failover to an alternate zone if the primary zone fails (yes, you will pay more money until you move the reserved instances, but presumably the failover is temporary e.g. 8 hours, and you can fail back once the zone is back online).

The issue is that I can see how you can achieve 1 or 2, but not 1 and 2 at the same time.

To achieve 1, I would specify a single subnet (and therefore AZ) to deploy to, as part of the autoscale group config.

To achieve 2, I would specify more than one subnet in different AZs, while keeping the min/max/capacity setting at 1. If the AZ that the instance non-deterministically got deployed to fails, the autoscale group will spin up an instance in the other AZ.

One cannot do 1 and 2 together to achieve a preference for which zone an autoscale group of min/max/capacity of 1 gets deployed to while also having automatic failover if the zone I am in fails; they are competing solutions.