I got a "Computer says no" response from my insurance company when I asked about extending the cover to mods, and there isn't a snowball's chance of my wife agreeing to cancel the policy that is paid for jointly to re-insure with a more expensive policy with mods.
So my current plan is to find a pair of struts and rear springs. If I can swap these over easily enough I can have a short set and stock set, drive about day to day on the stockers and sling the short set in occasionally for weekend shows and that sort of thing.