I would almost say it makes the most sense to explain it all out like Rich says then either split it or match whichever you think would actually happen with the company, perhaps propose 3 options 1) you both donate 1% 2) you each split it each giving 0.5% or 3) you personally donate 1% on your own side alone but you could emphasize how great it would be for you to do one of the first 2 as you would be directly donating more for the devs to improve the software you are using or at least basing other work on.
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I would almost say it makes the most sense to explain it all out like Rich says then either split it or match whichever you think would actually happen with the company, perhaps propose 3 options 1) you both donate 1% 2) you each split it each giving 0.5% or 3) you personally donate 1% on your own side alone but you could emphasize how great it would be for you to do one of the first 2 as you would be directly donating more for the devs to improve the software you are using or at least basing other work on.