Possible.
But for someone holding a stable coin, 30 Days is a very large period to incentivize and then a 3 days unlocking period as well. I guess may be first interest payment should be after 30 days, but should be reduced to 7 days or more often after that. Else, holding fund for 27-29 days and then if someone needs to extract/move funds, he would be missing on some decent amount, which isn't great for big holders.