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There are two problems with your drummer theory, 1 is volley fire and 2 is that it will only affect the orcs. The SL is very good but he is dull. If you really want to win then he is the way forward but if you want to have fun, go for someone else.
Wouldn't a drummer actually be more effective vs. volley fire than the SL? Either way you're getting hit on 6s, but with a drummer you'll get to combat quicker and thus take less damage. And true he'll only affect the orcs (and the warg riders)--if Uruks were added they would not be affected. But if the list is kept as is I think adding a drummer would be effective and thematic (although granted the SL would be more competitive).
I think you can make a fun Cirith Ungol force without tons of Uruks--sure they're fun to play with, but you don't need a huge number to get started. I think you'd be fine if you just picked up another blister.
This list is pretty basic, but you could use something like this as a starting point...
Shagrat, War Leader 110
Gorbag (shield) 50
6 Warg Riders (3 shields, 3 shields + throwing spears) 84
16 Orcs (shields) 96
12 Orcs (spears) 72
4 Orcs (Two-Handed weapons) 24
11 Orcs (bows) 66
7 Orcs (bows, spears) 49
3 Orc Trackers 15
6 Mordor Uruks (shields) 54
Named Nazgul on Horse 130
750 Points
68 models
8-9 Might (depending on which wraith)
21 bows
Then you could consider dropping Gorbag (or taking the cheaper version of Shagrat) in order to put your wraith on a fell beast, adding Shelob, getting more trackers, etc.
In terms of theme, Cirith Ungol is awesome! I always thought it would be cool to model the Uruk and the tracker who almost capture Frodo & Sam on the plains of Gorgoroth and end up fighting each other instead. There are also a ton of orcs that Tolkien mentions as being part of the tower guard... Snaga, Radbug, Lagduf, Muzgash. Lots of options for conversions and adding character to your army!