Hi, I'm not familiar with the enlarger but I looked at a few photos online and also found a PDF of the manual which showed a close-up of the lamp housing and how to change the lamp. My guess is it could be possible but may need a bit more "engineering" to make it work as the chamber holding the lamp is very much smaller than the Durst 138 housing.
Anyway there are rapid developments happening in LED lighting so you may be able to find a smaller unit with adequate lumens to replace your current globe. What wattage is the recommended globe for this unit? 75w, 150W, 250W?