Very clever idea, but it'll be hard to bring to life. Its not like coinbase and such don't want to trade securities, its that regulations make it very hard to realise. hopefully desico will be a pioneer in this area
They will pioneer the space for sure why dont you have a look at this article on medium & have a look around the Desico demo platform its very impressive link👉🏼! Please check DESICO pre final demo version of platform they are building. Your feedback on it is highly appreciated!
https://medium.com/@desico.io/exclusive-preview-of-desico-platform-now-available-79ba7702ca34