Feeding an interactive application?

Have a situation, in which a user must enter about 8 key fields in a 
maintenance program to retrieve data that needs to be changed.  This is a 
software vendor-supplied program (its RPG - but no source available).

We can extract the 8 fields the user needs from several databases.  The 
question is...is there a way to "feed" this info to the maintenance program 
screen?  We were thinking maybe using CL to read the extracted data from a file 
to "populate" the screen...and then have the user take over control and do the 
required maintenance.  We figure we can cut the user's time required to 
complete this in about half.  

Anybody done this????