Leak Repair on Waste Pipe ABS Joint Very Confined space

I have a slight leak on an waste ABS pipe 45 degree joint in a very confined space (I can barely reach my hand to touch it) that I need to repair. What ideas do you have to repair it?

The ideas I have researched were to spread ABS cement with ABS shavings along the edges of the joint or cut the pipe below and use a fernco coupling. My other ideas is cut below joint and install another coupling to be flush with it. To take it a step further, I could slip a fernco coupling over the hubs of these two connecting joints. Thoughts?

If you decide to apply any type of sealant or glue, be sure to thoroughly clean off minerals and crud first.
You can use a plastic scrubbing pad, soaked in vinegar.
And roughen up the surfaces with coarse sandpaper.
Rinse off the vinegar and remove all sanding dust.

There was another very similar recent posting by member Mozgus, titled
1st floor tub drain is leaking onto basement ceiling (picture inside)

Go read that posting and the replies, it pretty much was your exact same situation.

Very helpful! Thank you!