Average symbols for growing number of columns

Hello all,

I know this is likely possible, but I've been struggling to think of the most efficient process. Below is a sheet I'm working on, where trainers enter progress for a trainee in a given "soft skill." These trainer columns will be added automatically on a daily basis via an outside Power Automate flow, while the progress bars in the cells will be added manually.

What I'd like to do is return an average of the symbols between the two Helper columns (which will be hidden and used as the range start and end caps). I'm thinking I'd first need to convert these symbols into numbers (the Formula column). Then, I'd like to convert that number back into an accurate symbol (Averages column). How could we do this? Any help would be appreciated!

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