viaBTC never worked for me. I always have this: Submissions are beyond limit. Please try later.
Edited and added some more information to my last post.
Or you can try
https://pushtx.btc.com/ . Never tried it though and you will need to look for someone from china(?) to pay the fee on your behalf. They currently accept Alipay only and returns fund if the transaction isn't confirmed within 12 hours.