I think that providing public climate shelters will have to be part of the solution in some countries. There is a wide spread between “humans can’t work multiple hours outside” and “humans can’t be outside at all” for the likely temps in the next 100 years.
(To be clear, this is a stopgap to cope with the change as it happens, not a full solution.)
We could invest in cheaper and faster coffin production. Or invest in trying to get mass graves to become culturally acceptable. Or we could try and actually do something about the conditions that create the hellscape to come, but with our current mode of production and incentives around industry, I don't see it happening.
(To be clear, this is a stopgap to cope with the change as it happens, not a full solution.)