You cannot fool Econ 101. What Lauren wants to do would simply lock out lower-qualified/higher-risk borrowers from ever being able to get a loan. Economic ignorance is immoral and destructive.
Reminder that usury is immoral and unbiblical.
A flat fee mortgage wouldn't look like this.
You wouldn't be making payments for YEARS without the principal actually going down.
There is another way, and Christians should be pushing for change.