A simple hose from the intake manifold down to the booster inlet is all it takes for vacuum. It's not a mine field. You are the only one who thinks that. The kits are designed for DIY with possible light mods. The video shows the fellow doing it right on the shop floor. Many of us would do it on the bench with a vise and press and etc.

A dual master will not do much. It's a tad safer.
If you are not able to do disc or possible mods for MC, that's OK. That's how mechanics make a living. Most folks who own old trucks like to work on them with a little help from Stovebolt. You have received much info here of all kinds. It's all up to you to decide if the stated goal of........ "wife will not drive in truck until you do something" is met.

Let us know if you need further intel. Refer to my comments at #1333787 and other member comments in this post.

Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn