I'll suggest leaving the LineLocks attached for a while. You can run the thin cord through and knot it or tie it off, then use the MiniLocks on the other end as you intended.
After a trip or two you'll know if you want to keep the LineLocks or not.
I happen to like them. I put a permanent loop on the stake end, and just drop it over. Then I tension from the shelter end. I find them easier to operate than the Mini, especially in wet freezing weather. The weight penalty for 3mm line is worth it for me.