I'm not sure this is a good idea. Comments aren't meant to have answers to your problem in them; according to the help center:
When should I comment?
You should submit a comment if you want to:
- Request clarification from the author;
- Leave constructive criticism that guides the author in improving the post;
- Add relevant but minor or transient information to a post (e.g. a link to a related question, or an alert to the author that the question has been updated).
It's true that most users (even I) don't always stick to these guidelines, but given the purpose of comments, the only sort option which makes sense is sorting by time of posting.
If a comment really provides permanent value, edit it into a relevant answer (if that doesn't change the intention of that answer), or post it as a separate (Community Wiki) answer, with proper attribution to the author of that comment. Make sure the new answer actually answers the question itself; if not, it might eve be worth trying to turn it into a self-answered Q&A.