DON'T IMPLEMENT POS, IT HAS A SERIOUS VULNERABILITY.I strongly suggest you make it pure inflationary 5% PA. That's easy on you and provides better protection.
I got another idea -- make the 5% constant. The block reward will depend on the total coins minted, so over a period of 10 or even 100 years the inflation will remain the same.
What vulnerability?
The one in your thread? No , sorry , but no

.
As far as I know nobody has ever successfully done the attack you describe and you have critics who disagree with you. How can you be so certain it will work without a proof of concept demonstration?