Edit: I Read the post properly the replies are manual not automatic so I don't twitter will have any issue with it.
Per Twitters Rules for Identification of Spam[1]
-If your updates consist mainly of links, and not personal updates;
-If you send large numbers of unsolicited @replies or mentions in an aggressive attempt to bring attention to a service or link;
[1]https://support.twitter.com/articles/18311#
Edit: I Read the post properly the replies are manual not automatic so I don't twitter will have any issue with it.