Very late to the party here, but I’ve hacked up a REALLY simple Single-File-Component script:
https://gist.github.com/josiahbryan/fb9022d79ab909a7173c5d4855facadf
Posted that script for discussion just today at: https://discuss.emberjs.com/t/really-simple-single-file-component-support-for-ember-3-x/15438
Hope it helps! Cheers!