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While this doesn't entirely answer your question, it may be a useful resource if you aren't already familiar with it.
I too would be interested in knowing which languages use the single characters, but then also know whether or not users actually type out the correct character or opt for the apostrophe hack.
Name Country In boundary
Balochi (Latin) Pakistan ď ť
Bari Sudan ď
Czech Czech Republic ď ť
Lillooet (Mount Currie) Canada ľ
Slovak Slovakia ď ľ ť
Vod Russian Federation ď ľ