Hard not to believe Malawi would have a bigger economic upside from liberalising working rights and providing a pathway to citizenship.
Malawi doesn't have a functioning economy. It has a nominal GDP per capita of $464. It is heavily indebted and reliant on international aid. 80% of the population rely on subsistence farming and 70% live on less than $1.90 per day. Giving those refugees citizenship just means more mouths to feed; if they remain as refugees, then they're the UN's problem.
One of the most amazing things was craftsmen who machine parts out of ebony wood or other tropical hardwoods - and use these to keep engines running. (I remain perplexed how they handle high heat, temperature changes, etc., but it works). I have never met a people more able to keep an ancient motorbike running.
Not everything gets counted in GDP… I am not sure the country would be improved if it somehow got replaced with a lifestyle of living like Europeans or Americans.