I don't think this is the ultimate solution, actually I know it is not, but it might save you some time, after sending your message you can go to your "Sent Items" folder and forward the same message to the same number, you can go there by clicking on the "Inbox" on the top left and it will drop down a menu for your folders, click on the message you want to resend, then menu -> reply -> forward
add the number and hit send.
I think it might be easier jus to retype it
