Many MGP scooters come with HIC, which would work with oversized bars. If you're using SCS with your MGP fork, you'd need to go to HIC compression with an oversized clamp and slit in your bars OR full-size SCS (that can accomodate oversized bars) WITHOUT a slit in your bars.
You can't run HIC with standard diameter bars. It's impossible. They are the same diameter (or close), so one won't fit inside the other. However, IHC is a lot like HIC for standard diameter bars. You'll need a tapered IHC fork to do this.
If your scooter has HIC and you want to run standard diameter bars with IHC, you'd need to replace the fork and clamp, in addition to the bars. IHC requires a tapered IHC fork and a standard diameter bars as well as a standard diameter clamp.