The exiting inflation that is currently given to all SP holders would remain the same. The additional interest that is added to the "investor class" would only be for the SP above 250 MV.
What's the point? The people you are trying to convince here are whales, so why not give them as much as possible? The more rewards they have the more likely they are to get on board. Security wise it would also be better if moderators have a stronger incentive to not split their account.
If you do that, you now have a different group of people you have to "convince".
This whole proposal is for the other group at the end of the day so I'd say you won't ! They will finally get some more influence.
As we've found out though, some people would rather have money than power.