It looks like a long task which ever way I go and now I have retired I don't have the night shift to do such things 
An hour a day keeps the doctor away:
https://www.os2world.com/wiki/index.php/Book_Review:_Teach_Yourself_REXX_in_21_Days.
You could try to convert your data to DATABASE.TXT-entries, by using REXX.
You could try to use a good data file format as an input file for a REXX installer.
Or you can insert your data in REXX installer(s). My own choice, which often replaces and sometimes improves existing installers as well. At the moment 12 scripts, each smaller than 64 KiB, are saving about a day of RSI per install, and less disk full-errors in case of really old IBM hardware (mainly due to not having to have two back-ups of about thew same package, WarpIN and installed package). Mostly lines with SysCreateObject, albeit you can write an own SysCreateJavaObject function in REXX with all of the default Java settings (e.g. always with an embedded EXENAME=D:\PROGRAMS\JAVA6\JAVAW.EXE).
With your background you may not need 21 days, unless there appears to be a time-consuming lack of talent. After having read such a book you may want to browse through the list of all available built-in Classic REXX functions.
All programs in the book should be available digitally, nowadays. Surely the sample programs in the book are. The Classic REXX learning curve isn't steep, unless you want to write SysCreateJavaObject as a REXX DLL function in C.
Eighter way the answer to the question of the thought is: yes, sure, unless the data file format is rubbish/useless.