I believe mom-incubators are made for this setting.
https://www.momincubators.com
But an incubator could become an oven in the wrong hands, kangaroo-care is a safe alternative.
I was told about a project as a student, where worn out incubators where transported to a rural setting in a warmer part of Africa, but the children got overheated and it became a death trap.
Maybe the best people to hear with is MSF? I’m sure they thought this through.