Re-using expression-generated values to input into other expressions (read-out)

Hi there everyone. I was wondering if there is a way to 'capture' expression generated values and either buffer these values or re-using them directly in other expressions. I am trying to track rotations of parented layers, which are generated from the DuDuf IK expressions. Getting the rotation through a pick-whip will always return zero, of course; but as After Effects is able to physically show the expression generated value as a number, I guess it should also be able to output this number somewhere as a (buffered) digital value to be re-used somewhere again.
Anyone ideas?

Hi Dan, good to hear from you. I know, it sounds that easy. I'll try to explain this thing with a little more detail. If I can find a way to tackle this challenge, it will save me about 60 hours rendering each time this job passes my desk.
I have a standard (5 sec.) comp with four lines of text in just one font with a fixed size and everything. As explained before, I run a script that generates between 300 and 400 copies of this comp, giving each new comp a logical and unique name, ánd... replacing the contents of all text lines in every copy of the comp. Now the first line of text is easy: just a number. It's left justified and the layout is always correct. The second, third and fourth line are actually a few people's names (the whole comp is actually a crew title for participants in the Dakar rally), where every name is followed by a three-character nationality abbreviation, like USA, or GER or FRA and so on. You must understand that the comp is built up in seven independant text fields, of which each one gets its content automatically through the mentioned script from an Excel sheet. Now here is the problem:
The designer who created the layout for the titles wants to have the three-character nationality abbreviation exactly one character space BEHIND the name in every title. Ofcourse, the name (set in its own text field and AE layer) is pretty variable in length, so the position of the nationality field that comes right next to the name field, needs to be automatically adjusted in accordance with the name field length. To determine this position, the designer wrote (or adapted) an expression that samples the 'image' of the preceding name title, thus finding the rightmost white pixel (the titles are all simply white on black) and thus, with a certain offset, generating the right basic position for the following title.
Now I thought I checked thoroughly for a possibility to extract the rightmost 'bounding box line' of a title in another video layer in AE somehow, and I couldn't find it; whereas you mention this can be done. If that is really possible, it would save my day...
All I ran into was that text layers are always comp size (thisLayer.height and thisLayer.width always give 1920x1080 in an HD comp, no matter how small the text in the text layer) and therefore it seemed impossible to me (and the man who wrote the expression probably) to get any useful info concerning the characters positions and bounding boxes etc.
So: how can this be done? How can I measure directly what the position value of the rightmost pixel of a line of text is and pass that on to another layer's position? In that case I can work around the time consuming sampleImage expression.
I'm sure someone is going to send you a big bottle of wine on this one .... :-)

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