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

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Good for you, you stock up PoS coins, but I see reasons for investments and don't trust my feelings so I wont invest or mine any PoS coin.