I do use the music rest when set up on a table stand. I may start to use that setup more. I just didn't know if the music rest wold be big enough or adjustable enough. I searched forever for a compact two tier and like you found no suitable second tier attachments for any table stands. Didn't want multiple pieces when I move. The Standtastic one is the best I found. A bit shaky setting it up with the tiers hanging loose but only takes a minute and packs up small.
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Bill in SC --- Roland BK9 (2) Roland BK7M, Roland PK5 Pedals, Roland FP90, Roland CM30 (2), JBL Eon Ones (2) JBL 610 Monitor, Behringer Sub, EV mics, Apple iPad (2) Behringer DJ mixer