If you opt to make a complete disclosure, there shouldn't be a need to use two separate software programs for one disclosure. You may need one to do the calculations and one to print the results.
Years ago I wrote some Excel spreadsheets to help our lenders on the construction calculations. While my APRs were within tolerance, they weren't exact if the lender included odd days. I never got the Fed calendar right for those.
You could try to use Excel or Lotus to do this yourself if you can get it to work. You could also find a consultant or vendor who may already have a product or could customize one for you. Used in conjunction with your existing software, you may be able to streamline your process.
You may be able to search on keywords to find someone or speak to an existing vendor. If it was me, I'd also look at APR Systems. That is Richard Insley's site. I still use his APR Examiner from compliance school and I think he still does custom calculators. If he doesn't he may be able to refer you.
Opinions stated are not necessarily that of my employer.