On my Bucker, the primary harness is attached to the fuselage structure while the lap belt (safety belt) is attached to the seat. Since RV seat bottoms are just a pan, if you want independant attach points, you will have to engineer something similar to the primary attach point.
I consider the lap belt to be there in case I have a primary belt failure or disconnect. I would not be concerned about a structural attach point failure and would imagine that to be extremely rare.
So, if it was me, I would do what some of the others did in the post you attached and modify the primary attach point to allow for the lap belt to be added.
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Smart People do Stupid things all the time. I know, I've seen me do'em.
RV6 - Builder/Flying
Bucker Jungmann
Fiat G.46 -(restoration in progress, if I have enough life left in me)
RV1 - Proud Pilot.
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