1967 k member upgrades (idler)

I have ‘67 Barracuda and i am working on some engine bay upgrades. I was wondering about the 1967 one year only idler arm. I have read about swapping in a later k memeber from a ’68-‘72 to get the bolt through idler arm.

I have a ‘71 k member. The spare ‘71 k member is a rusty, beat up, small tear from a tow hook and has undercarriage rod rash, dents and dings. The 1967 k member is pristine. I want to get away from the one year only single point 1967 idler arm and I can and do own a mig welder.

Questions....

1) would you rework/fix the ‘71 member or is to too difficult to cut off and relocate the ‘71 idler arm bracket over to the ‘67 k memeber.
2) would anyone weld the k memeber seams solid to increase the k member strength.
3) are there any common failure points around the power steering mount that need to be shored up while the k memeber is out of the car?

Let me know what you guys would do with the k memeber out of the car. Once all of the metal work is done the k memeber is headed to the powder coater.