[Lumix S5] is the [Atomos Ninja Ultra] the best option for affordable storage, easy workflow and recording in 4k, 24fps (Youtube/Music Videos)

Hi, thanks if you take the time to read/reply.

*Not too familiar with cameras*

I want to record Music/Home videos with my Lumix S5.

I only have one V30 sd card. It fills up quickly and takes ages to transfer the data.

SD cards seems violently expensive though.

Is it advisable to buy an [Atomos Ninja Ultra] + 2tb SSD or maybe a [Black Magic Design Video Assist] + 2tb SSD?

As stated above my goal is to record in 4k, 24fps and edit straight from the external SSD to accelerate my workflow and enable me to have long uninterrupted recording sessions.

Overkill or good idea?

Thank you :)