The hot priming liquid shouldn't be an issue. How long was your beer in primary and/or secondary before bottling? If we're talking many months it could be possible that the yeast dropped out of suspension so there was very little, if any in your bottles at bottling time.
But even then, unless it was more than about 3 months that is still kind of unlikely.
But to answer your question, yes, you can add a a couple granules to each bottle and recap and that would hopefully get them carbed if it really is an issue of no yeast in the bottle.