Matt,
You could try the following methods:
(1) The modeller method:
Create your letter as normal. Then, in another layer, create a dense pointcloud that covers the letter how you want. Next, use the solid drill function to take out the points outside your letter's volume (not sure off the top of my head the settings for this - you'll need to play).
(2) The hypervoxels method:
Create the letter as normal. Load into layout and make it unseen by camera and rays (so it's totally invisible) - you can also do this with a 100% disolve. Now, place a particle emitter inside the object and set your particle motion settings so that the particles move aorund and fill the letter. (See Philip's excellent Lava Lamp tutorial for some pointers on how to do this).
Hope this helps...
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