I also run Omega and have totally given up on Composer's merge feature. I use SignLab to do our stencils for donor bricks, and with a few clicks of a mouse I can literally have thousands of customized layouts instantly on the screen merged from Excel or a tab delimited text file.
I've yet to figure out why software companies are not incorporating the "best of" features into their own products...so I guess that's why I continue to run Omega, SignLab, Adobe Illustrator, CorelDraw, PhotoShop, and AutoCAD. I'm still waiting for a single program that combines the top-gun strengths of each but it won't ever happen.
Your best bet might be to have somebody set it up in SL and export it to file you can use for your application.
JB