Got a pair of Illuminated rear grab handles from a 400 on ebay a little while ago .

the lights are switched independantly so do not require the door to be open as long as you use a permanent live feed ( just remember to switch them off again after use )
I have used the permanent live feed to the interior light which is accessed by removing the trim across the front of the headlining , the sun visors and the A pillar trim ,
fed the wire under the headlining ( one to each side , ) removed original grab handles ,
cut some plastic from the foot plate of the new handles ,
fitted using original rear screw fitting and drilling a new hole for the front one( the handles from the 400 are a bit bigger )
then its just a case of fitting the earth wire (could use rear grab handle fitting screw as earthing point or extend the earth wire to a convenint screw )and connecting the live feed
Be sure you want to do this as if you damage your headlining it will really mess up your cars appearance There will be a screw hole in the headlining where the old front screw went but this is hidden by the handle once fitted.
Do not attempt to bend the handle to make it fit the original holes or the light unit will not fit properly