For anyone who cares, MIP released a 4mm and 5mm in the speed tip only. After talking with them, there's no plans for a handled version so the separate quick release handle will be required. Kinda a bummer, but pulled the trigger anyway.

MIP 4.0mm Speed Tip Hex Driver Wrench
www.miponline.com

MIP 5.0mm Speed Tip Hex Driver Wrench Gen 2
www.miponline.com

MIP Speed Tip™ Handle #9220 | Upgrade Your Hex Drivers
www.miponline.com