Is it OK to use 子 as a measure word
Classifier for 'bundles/hanks' is '束', as in '一束花' (a bundle of flower); '一束头发' (a hank of hair)

The only classifier using 子 is for 'chess/ Go piece' or 'chess/ Go move',

Example:

'讓你兩子棋' (give you two stones handicap) 

"需要深入思考每一子棋" (need to think deep for each chess move). 

'步' as  in "需要深入思考每一步棋" is more common that 子 when using as classifier for chess move

A prominent example for 子 as a classifier for chess/Go piece:

一子錯, 滿盆皆落索 - one piece (of chess) (placed) wrong, the entire game (situation) become untenable