Bro yes u can visit dudipatsar via dharamsar lake, another lake comes just afer dharamsar called sambaksar lake, and there are 3-4 more un named lakes. we did this trek in Aug 2014 and we continued till saral lake nd then till ratti gali lake. it will take a full day of trekking, we only managed till Mulla ke basti and camped there. but we wasted atleast 1 hour because our guide was not sure about route. trek is not very hard but its a longer route and beautiful 1.if u need any further info pls ask or i can share the map image with u if need which developed by my frnd haseeb (Starting Point: Near Dharamsar Lake - 7 Km East of Babusar Top (35°6'33.65"N, 74°6'23.89"E)
Ending Point: 800 m Above Mulla ki Basti (35°2'12.99"N, 74°3'6.26"E)
Lakes Covered: Dharamsar Lake + Sambaksar Lake + 4 unknown Lakes
Total Trek Time: 9 hours
Distance Covered: 11.9 Km
Average Speed : 1.32 Km/h
Minimum Height: 3987 m
Maximum Height: 4306 m
Average Height: 4124 m
Total Ascend: 580 m
Total Descend: 590 m
Note: The Map is reconstructed using actual GPS Lat-Long values)