Loop and merge based on carried forward info (but only if more than four options are chosen)

Hi all,
I have a survey where the respondents will be asked what activities they take part in, and then I have created a Loop and Merge-block to ask a battery of questions about each activity. But I need to limit how many loops they go through as the survey could end up being very long otherwise, so I want them to choose the four most important ones if they choose more than four (but I still need to record the others, as that is important data).
I have created a new question which only shows up if they choose more than four activities, and have their choices carried forward, asking them to choose the four most important ones. But then I cannot set the loop and merge to use either the first question or the question with the carried forward answers. I also don't want to set the Loop and Merge to present four random loops, as the importance is very relevant for my research. I also tried to set conditions in the survey flow, but that still requires me to set the loop and merge to a specific question, unless I create two sets of loop and merges, but that would make my data very unruly, would it not?
How would you solve this?

(Apologies in advance if a similar issue has already been discussed, I have searched extensively but perhaps I have missed out on a keyword or function)