I've been wanting to get one for a long time so I checked them out. The trick would be fitting a bigger battery into the handle--if you could fit a slim batt in by drilling out room for one you'd have it made. It wouldn't operate as a screwdriver but hell, you've have the coolest rig anywhere!
Elisabeth Sladen is one of the two costumes I'm looking for parts for. I remember her original episodes with Tom Baker--our PBS stations in WI showed them here.