How to downscale 4K to 1080p?

Hey guys. I film in 4K a lot so I can punch in and out using one camera for my interviews. I've been dropping my 4K footage onto a 1080p timeline then manually scaling it down to 50% for full frame shots, then scaling to 100% for close ups. I only need to export at 1080p.

Am I doing things the right way or should I be converting the footage?