Looking for a hack - Passing comment-like info through the binary log

I am facing an interesting problem. I need to mark somehow a statement in such a way that the comment is preserved through the binary log. I don't have control on how the statement is generated or using which client software. For the sake of example, let's say that I need to mark a CREATE PROCEDURE statement in such a way that, if I extract the query from the binary log and apply it to another server, the information is still available.

Background

Normally, I would use a comment. The first thing I would think is
CREATE PROCEDURE p1(i int) select "hello" /* This is my text */
But most client libraries will strip it.
There was a clever trick by Roland Bouman that allowed users to bypass this limitation. You could use a qualified comment such as /*!999999 This is my test */, but unfortunately it only works in MySQL 5.0.x, while MySQL 5.1 strips everything down, even if the comment is a legitimate keyword.

create procedure p9 (j int) insert /*!50000 INTO */ t1 values (j) ;
Query OK, 0 rows affected (0.00 sec)

 show create procedure p9\G
*************************** 1. row ***************************
           Procedure: p9
            sql_mode: 
    Create Procedure: CREATE DEFINER=`msandbox`@`%` PROCEDURE `p9`(j int)
insert  INTO  t1 values (j)
character_set_client: latin1
collation_connection: latin1_swedish_ci
  Database Collation: latin1_swedish_ci
1 row in set (0.00 sec)

Other tricks

Something else that I have tried: I can inject a query before or after the one that I need to monitor.

create table if not exists comments (t varchar(100)) engine=blackhole;
 
update comments set t='the next statement is what I need';
create procedure p1(i int) insert into t1 values (j);
update comments set t='the previous statement is what I need';

This approach does possibly introduce some overhead.

Or I can add a comment clause in the statement.

create procedure p1(i int) comment="this is what I need" insert into t1 values (j);

This approach requires parsing the SQL, and dealing with artistic indentation and usage of other options in the query. And if I need to deal with commands that don't support the "comment" option, I am back to square one.

Advice wanted

So far, the only method that works almost always is the blackhole trick ⁽¹⁾
I would like to know if there is any method of introducing a piece of information related to a given statement, in such a way that the comment survives after one of the following:

• The binary log is converted to queries and passed to a MySQL client that applies the stream of queries to another server.
• The binary log is associated with another master, and then passed to a slave through regular replication.

In both cases, I need to find the original information in the last server's binary log.

As a related matter, I know that MySQL, in regular replication, passes some information across binary logs, and that information is the server-id. If I set an intermediate server as relay slave, the server-id of the original master is associated with the query recorder in the binary log of every slave. I don't know if I can use this information for my purposes, but I would like to know how does the replication process maintain the server ID across servers.

Maybe it's too late for me and I can't see an obvious solution. I will appreciate any suggestion. Thanks in advance

⁽¹⁾ If the blackhole is disabled, the method fails, or introduce unacceptable overhead.