I was a part of a team which tested the converted VAGen code into the COBOL-CICS-DB2 one, three years ago. The migration was done by a third party using an inhouse tool they had developed. However, it required manual corrections, fixes to the code to replicate the functionality but eventually successfully migrated nearly 2000 modules.
Our system has about 5000 VisualAge components (this includes applications/programs, static tables, record layouts, map groups, maps, linkages and functions/subroutines). The system once had a large database of clients but now most have been migrated to another system and the remnants are somewhat "niche" players.
VisualAge 4.5 that we are using has gone out of support. There will be development work of some kind in order for us to move forward with this functionality.
As I see it, we have a few options:
1) Move the functionality elsewhere (significant development; probably not a user-friendly solution)
2) Upgrade the VisualAge software to a supported product (significant cost; migration effort)
3) Convert the system to native COBOL, CICS, DB2.
I have been working with this kind of project since 1999. But, my first version of this tool/filter was developed in 1987 using CSP versio 1.3 and DB2 1.2 written in assembler. In 1999, this product was modified and we have been improve new function, and facilities until now.
I am responsable for this develepment and I think that I could help you. I did some project in Brazil. If you would like to test some programs to know the results no problem for me.