Readline macro question

[Robert E. Griffith]

Is it possible to prevent readline from echoing the text entered through 
a macro?

Example:

   $ bind '"\eOP": "\C-aecho '\''<up>'\'':\C-m"'
   $ echo '<up>':hello    # i typed "hello" then pressed F1 key (\eOP)
   <up>:hello

Want I am trying to achieve is ...

   $ bind '"\eOP": "\C-aecho '\''<up>'\'':\C-m"'
   $ hello    # the macro leaves the line as it was
   <up>:hello

It would also be ok to write blanks which would effectively erase the 
line...

   $ bind '"\eOP": "\C-aecho '\''<up>'\'':\C-m"'
   $
   <up>:hello

So I tried using the CSI conceal  code like ...

   $ bind '"\eOP": "\C-aecho \e34m'\''<up>'\'':\e0m\C-m"'
   $ echo mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm'<up>':hello
   mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm<up>:hello

But the default ESC binding is to metafy the next character. Removing or 
replacing the ESC binding had no affect so a related question is "Is is 
possible to embed CSI codes in a macro?

   $ bind -r "ESC"     # had no affect
   $ bind '"ESC": ""'  # had no affect

--BobG