Looks like over night they have added access to upload right from rainwise.net to CWOP.
Hopefully more to come.
Wow, ask and ye shall receive. Those entries for CWOP and Met Office weren't there the last time I checked my settings. I'll have to figure out sending to CWOP this afternoon. Thank you Rainwise!
EDIT: I just set up my account. It was so easy I did not think I was done. I thought there had to be more to it. Click on the link from the Rainwise.net get your ID from CWOP, enter it on the Rainwise 3rd Party Services page, hit enter and you are transmitting to CWOP!