Another for ESI.

FSA XL11s are pretty good for the price.

Yes

Just plain old water as per instructions.

You shouldn’t have a problem.

Just remove the outer and middle and replace with bash and 34t-36t nine speed ring.

I converted my 3X10 770 XT cranks to double and bash with 36/24 rings on my 2011 five with zero issues.

2×10 conversion