I can't write LUA and i havent created a Weak Aura like this before, but one way of doing it is to create a specific Weak Aura for each players and make it track the debuffs for specific players, and then make it whisper the target with instructions under actions.
I know you said you dident want me to link a done one, but if you don't understand what i mean here is an example
Code:
dGJycaGlvuBtIyMiLmxjQzlv3uf5Bku7ePyVKDRu7xsDyk9xv43iAzsYqLadwknCQOdsvmmKQJHqNtI0crk1sfv1IPkTCk(SqEk4XIYZfzIcLPkyYkA6qxuOsxvuLNPGRJKnsL60QAZkz7cv5SIk(QqvnnQKVlHAKkKXkuXOrW4LGojv4wsixtkopv1TvPlJ61IkTiQGGxGJnYMLnJl7iJCNk7X73F0)ye1gzZXjRjxE6M0eJTibbjbvNjEM(5XcUcMcMkiy(jNDRFGlefiWMHp5oPGGeAnOccUCkzJyb5qsv3UzEw3IK1TtY62CQBl(rc1TXPUDYEPwlbxoLSr8b67Kfe)roGcIB(cMKhxoLSrSOTGlNs2i(yYjuqm2UekuaA(Oi2OGaQ9JcU81lBeKCYz)6ZYB)OGySDjyBVCsbrdrbEm437SXxOGj7LATc(ozbJ8K)j35rlHcmC0tUd(ozbixikO4FIeKBxn0hkzyWvd9QHXL2uPvrnvc2u3G5JIyts0quWpfeJTR62c6wF2KeqG)icOC7QH(qjddUAOxnmU0MkTkQPsqN0ovqW8xRpJQJ(ki4s1XxbHcfyi7SccUuD8vqOqbOTZBubbxQo(kiuOaJnJvqWLQJVccfkuOaRcc8yWV3zJVahBKnlBgx2rg5ov2J3V)O)XiQnYMJtwtU80nPjgBrccfeprdrxvefkb