Basically create a backend and edit a front end to a Ultra-Affordable Email Security SaaS company that will be an ultra affordable one stop shop that does everything Mailhardener, Hardenize, OnDMARC (redsift) etc etc all do plus a surrogate DANE/DMARC placeholders for ESP customers that don't get provided those other type of MX records. Also provide the creation of certificates, BIMI records, and CMC s'. Charge a stupid affordable price for this. Like $5 a year, and another $5 a year for priority collaborative support. A value added addon of a UG-CMC and UG-PSC (universal global) certificates for a one time fee of $10. A registry of these that ESP s' can use that also has a place people can upload their PGP keys to (both ESPs' and customers of those ESPs').