[Remind-Fans] newlines with -k

[John Harrigan]

Is there a way to embed newlines into the MSG output when
using the -k option?

For example:
   MSG one%_two

will print a newline between one and two if I don't use
a -k.  If I run:
   remind -k'xmessage %s'

it just prints a space between one and two.  I've tried
various combinations of xmessage and echo but nothing
seems to work.

The closest I've gotten is to use embedded '\n' characters
in the MSG string.  For example:
   MSG one\\\ntwo

with the command:
 remind -k"echo -e %s | xmessage -file -"

will output a newline but it also prints an extraneous
backslash.