You can certainly dose calcium formate DIY, if you can find it at an acceptable price. Cost has always been the issue with that method, and is perhaps why some companies (e.g., Salifert) in the past have chosen calcium acetate.
Awesome! Ill be doing it with the powders and it should make gallons of the stuff diy, compared to its readily made counterpart... Or ill see what i can do with kalkwasser since that doesnt have trace elements either