Crowsfoot or other for this nut?

[noid]

Immediately to the right and above is a metal heat shield. Though possible to remove the heatshield, it would require more disassembly not pictured that I would rather avoid.

Nut is attached to a balljoint, so no option to counter hold the nut and unscrew from below.

I was thinking a crowsfoot, but at this angle I’d need a swivel and a crowsfoot - that setup would push upward almost as much as it would apply counterclockwise torque.

Thoughts?

 

[SRU1436]

Ratcheting flexhead wrench?

 

[Twisted Sid]

Torque adapter and an extension on a ratchet?

https://capritools.com/shop/3-8-drive-torque-adapter-metric/?cgkit_search_word=Torque%20a

 

[seber]

I'd use a wobble extension and hold the crowsfoot in place with my hand.

 

[NUTTSGT]

Since you are debating how to do it, the very first thing I would so is go out there and spray it with some WD, Liquid Wrench, PB Blaster, Kroil or whatever you have on hand. Letting it soak a day or two will increase you chances of it coming off without busting a knuckle.

It's really hard to imagine what will work as a picture isn't 3D. Swivel with short socket, flexhead wrench, crows foot, wrench with an extender ? All viable options.

 

[cmandp]

Nut holding the taper on a Balljoint? Those are usually fairly large thread and thus higher torque.
I like to use an impact because they often like to spin the stud once you loosen them enough. Sometimes disassembly is easier then trying to find a clever way to turn things in situ.