No, not in morse code. Instead, the computer will (through vibration) cycle through a list of likely last moves, and you confirm the opponent's last move by clenching right after it comes up. This minimizes the considerable risk of incorrect move entry.

The list will also include a special entry indicating "none of the above", which will make the computer switch to the next set of less likely moves.

This scheme could be refined be having some move partitioning on top. For example, an initial list that has only ["pawn move", "light piece move", "heavy piece move"].

I'll leave it as an exercise for the reader if morse code via butt clenching counts as "plausible"

If it can cure depression, I don't see why it can't also improve your chess game.[0]

[0]https://www.goodreads.com/en/book/show/331807.How_to_Good_By...