For this right-angle drill chuck key: https://amzn.to/47Tyf2n [affiliate link]
As described on listing: RealPlus Right Angle Attachment 90 Degree Cordless Right Angle Drill Adapter with 3/8" Keyed Chuck 8mm Hex Shank
Long story short, the tool seems fine, but I suspect I'd loose the chuck key at some point. Thus this solution. Fusion360 file included. Have fun!
The author marked this model as their own original creation.