I think the British empire's approach of killing culture and languages is overlooked in these discussions also.
From an Irish POV, oppressing our language, religion, sports etc... is cited as often, if not moreso, than the famine and murder went on during British occupation of the whole of the island.
Not having our own language as the spoken language in the country is something we still find hard to grapple with. I can't speak Irish and would much rather it was our number one language than British.
It's not something that is, nor should be, looked at rationally in a benefit v cost sense. Which is also a reason that I don't agree with reparations, at least not insofar as paying a former colony X amount as penance.
Donating to or contributing to a former colonies culture is how it should be approached and I think an obvious and easy way to start that is to return any stolen property currently held in the UK. It will cause a lot of logistical complications and would likely work similar to how certain priceless pieces of art can't be sold on the market as a fallout from WWII but it would be a small price to pay and a very big gesture. The death, murder, famine etc... is something that has happened and can't be valued imo, alternative resolutions and comminications should be sought.