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Hi,
For safe light sources, you may want to look at the design for kerosene lamps from Sri Lanka https://www.safelamp.org/ or these vegetable oil safe candles https://www.asafercandle.com/ . They are both very effective in preventing fires due to accidental tipping. Solar lanterns are also an interesting option, but their weak spot is rain.
But as you mentioned the main causes were cooking and heating stoves, here are some interesting online libraries for improved stoves designs. Unfortunately, it seems most attention is goven to indoor air pollution and fuel efficiency, so there is little on stove safety.
https://www.cleancookstoves.org/resources/ https://www.aprovecho.org/lab/rad/rl https://www.hedon.info/Resources?bl=y https://www.engineeringforchange.org/solution/library/viewAll/Energy