Sorry, crossposting left out the essential comment.

I had two TRRS cable: a coiled one and a straight 3-feet one. Both were a hassle to carry around and use so I looked around to see if there was something better and this was the best I could find.

TL;DR - https://www.amazon.com/dp/B074QJRDCJ

Features:

• Short - just long enough use my Let's Split slightly apart and angled.
• Angled - when moving around, I place my keyboard on top of my MBP keyboard and TRRS cable that sticks out straight bumps against the screen.
• Cheap - for $8 USD, you get TWO of them. As I'm waiting for NovelKey's Kailh socketed MX Let's Split Kit, this is great.