jmLÒBadger Wallet for mobile phones now allow you to sweep SLP tokens from a paper wallet!
Get it: badger.bitcoin.com
https://news.bitcoin.com/cold-storage-and-bearer-bonds-how-to-print-an-slp-token-paper-wallet/
https://whatsonchain.com/tx/6d5db91b7166507dccaf06f8b590aacfca0b2b9bfd3d20b5288d734cb09cbca3