EDIT: The only thing I can think of now of how to combine them, yet again ignoring "piece 7 source", is only by replacing numbers with corresponding code pieces, like
94 = DF2F (piece 9) & SCRD (piece 4)
73 = WALF (piece 7) & SSBR (piece 3) etc.
:
DF2FSCRD WALFSSBR C4GDRDHG XGMASSBR XGMASSBR WALFRDHG SSBRSSBR 3STYC4GD
There's no 6 in this numbers, by the way.
EDIT2:
Another thought - "piece 7 source" was fifth tweet, "Is anybody listening?"
Converting to Braille (only up to i=9, higher are --) this phrase gives
EDIT3:
Regarding "piece 7 source" - squares_codes_07.jpg source code? Like, something to look in HEX-editor?