Customizing wanderlust reply header

[csj@myrealbox.com]

When I invoke (meta-X) wl-summary-reply-with-citation, I get the
following reply header:

  At Wed, 12 Nov 2003 10:57:52 +0900,
  somebody wrote:

I think this reads better as:

  On Wed, 12 Nov 2003 at 10:57:52 +0900,

or perhaps even a more verbose:

  On Wednesday, November 12, 2003 at 10:57:52 +0900,

I grep'ped for the elisp that handles the reply header to the
function "wl-default-draft-cite" in the file
"wl-2.10.1/wl/wl-draft.el".  By changing line 704:

  (setq cite-title (format "At %s,\n%s wrote:"

I now get when I reply:

  On Wed, 12 Nov 2003 10:57:52 +0900,

Is there a better way to customize the wanderlust reply header
than hacking the .el file?