No idea why nobody is acting on it - maybe nobody else has thought of it yet. While the idea of there being attenuated strains out there is nothing radical, the idea of using them is.
Please everyone if you know someone you think might be able to help make this happen then spread the word. You are even welcome to steal the idea and claim it is your own :)
Have you considered sending this as a letter to a medical journal? I know it's not a "scientific article" per se, but many journals have a section dedicated to letters. For example, CMAJ (Canadian Medical Association Journal) considers such letters, and right now they're fast-tracking anything COVID-related: https://www.cmaj.ca/
Please everyone if you know someone you think might be able to help make this happen then spread the word. You are even welcome to steal the idea and claim it is your own :)