Well this was fun! To be honest I'm not that good at (comfortable, confident etc.) working with arrays in VBA. I do however enjoy array formulas. So this spectacle of a solution uses Textjoin both horizontally and vertically on a separate sheet to solve the task but only for one cell. VBA is then used to loop through and bounce each cell off the calculation sheet and back.
I'm sure some people here would rather swim with crocodiles than using a wacko macro like this but overall I'm still satisfied with how it turned out.
All the formulas look like this:
(array this one)
Edit: reuploaded, there were some bugs
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