jmLÃslp-cli-wallet v1.7.5 adds the ability to sweep a paper wallet that contains SLP tokens! This is an alpha release. Please try it and provide feedback:
https://www.npmjs.com/package/slp-cli-wallet
https://whatsonchain.com/tx/539339a3d8255b4221e1a3c0c5d050e60a056ad216208f60bcb2a679449d3290