Without seeing your research, I suspect there may be two confounding factors. First is you are working with policy experts - not publishing scientists - who will be more remote from the state of the science. Second is the foresight problem: It seems impossible because we haven't done it.
That's not to disrespect your important work which is valuable on its own terms, but we have the consensus of the scientific community in the IPCC's sixth assessment report demonstrating that 1.5C is possible, and 2C is also. It then becomes a question of whether we choose to create those realities.