Combine Separate Projects into One Project Keeping Triggers and Quiz Results

I know this has been a while since you have worked through this questions - my followup question riffs off of this concept - of the combined results slides - we offer a pretest allowing learners to "test out" of modules - thus allowing them to skip taking subsequent quizzes in the "posttest." Let's say there are 4 Modules the learner fails the pretest, but passes 2 of the modules. In the post test they will be asked to take only the two they failed.  So now a combined final result page calculates the results based on the 4 modules but the learner has only taken 2 of them.  (We have been doing the calculation behind the scenes and reporting to the LMS using a JAVA code - but not all LMSs take the Java code so it has been problematic). Any suggestions or links to other conversations on this topic, or is this just not possible to do?