Try this...it ain't perfect, but might put you on the right track!
Select F3:F17 (the Available box) and enter this array formula (while all of those cells are selected)
=INDEX(B3:B17,LARGE(--(NOT(A3:A17))*ROW(1:15),ROW(1:15)))
Hold down Control + Shift and press Enter. The formula will get {}'s around it and look like this in the cell
{=INDEX(B3:B17,LARGE(--(NOT(A3:A17))*ROW(1:15),ROW(1:15)))}
The problem with this formula is it repeats A on the bottom when you start checking boxes. it does remove the letter from the list and shift the rest up, but it adds an A on the bottom for no value...
idk
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