DBISAM data import utility for data from Clarion for DOS w/ custom mapping

My custom Delphi program uses DBISAM db, and has built-in data import utility from old Clarion for DOS app. The import map was never done right/completely but is functional. The step to a separate utility for me to create a custom map for a particular client import was never started. Original programmer is unresponsive. I have limped along for several years with program as is, but now have two clients with issues that can be resolved with custom import from Clarion for DOS file to DBISAM file for Delphi program. Proposed project is to build utility for custom import that I (technical user but non-programmer) can map fields in to use for the occasional client like this. Tiny market so looking for very inexpensive solution. Possible alternative/intermediate project would be to do one or both of these imports for me without providing a customizable utility with mapping, if that would decrease delivery time and/or cost significantly?