CYYJ
Michael
I'm thinking of giving the risers a try...
I fitted 'Poor Man's Risers' on my ST 1100. That consists of just buying an additional 2 pieces of the top clamp of the handlebar and a couple of longer than normal bolts, then installing the 2 new top clamps upside-down on top of the existing bottom clamps.
After doing that, I was able to put the original plastic cover back on again, although there was a slight gap around the ignition switch (exactly like Phil's photo above).
Below is a picture of my 'Poor Man's Risers', and also a picture showing the plastic cover re-installed after the risers were fitted.
By the way - there are lots and lots of those plastic covers (both pre and post 95/96) available on eBay. My guess is that they are parts taken from ST 1100s that have been broken up for spares.
Poor Man's Risers
This is what the standard installation of the handlebars looks like.

This is what it looks like after installing a duplicate set of upper clamps, installed upside down.

The original plastic cover, re-installed after the risers were fitted
I cut a wee bit of plastic away forward of the ignition key, to make key access easier.
