Provide a Capability to Substitute A Crew Resource with Another Resource Outside the Crew

Use case:
Customer uses crews to book a group of resources (i.e.) a technician, an equipment and a vehicle to a job. But lets say when commuting to the customer location, the vehicle breaks down and needs to be substituted with another vehicle.
With crews, we do not have the substitute option for bookings on individual resources. We only see an option to rebook the entire group.
This is a very common scenario and its bad that we are not able to see the Substitute option for an individual crew member.
Even if we set the Crew Strategy to Self Managed, we don't see the option for Substitute at individual resource level.
Hence the ask to provide the capability for substitute for individual resources inside the crew.