Blocking dependencies

We use Bamboo to run HITL (Hardware in the Loop) testing. In order to run the HITL plan, a commit must first pass the Systems plan. The feature I'm asking for is for a commit or branch to be blocked at the HITL plan until it passes the Systems plan.

Conceptually it's similar to the existing dependency blocking strategy feature. The problem is the existing dependency blocking only works within the context of parent and child plans, and only blocks if the build was triggered by a parent building, not if the build was manually triggered or scheduled. I want a general way to say "Don't run this commit on plan B until it has passed plan A"