If you're "handy" with spanners and a soldering iron there are many different ways to achieve this.
There are after-market transmission ECU's that claim to do this for the 5-solenoid T.T. box, yet I have yet to see one fitted and working?
Another option would be to fit a Syvecs and supporting mods mapping etc, @ £4k+? (SRD can provide this service)
Alternatively, you could fit an N/A valve-body to the T.T. box and use a Soarer throttle-body, which allows you to use a Suprastick ECU which can control the 3-solenoid valve-body.
Plenty more information here. http://www.mkivsupra.net/vbb/group.php?groupid=57
Edit: P.S. I hadn't noticed that you are not a member, you need to be a paid member to see these pages.