I like relays. I'm cheap so I bought a Voyager relay box, mounted under the hood. Used it for headlights, ignition / charging, the electric pump, etc and have at least a couple left over for "other stuff"
Bussman makes boxes you can configure as you like
You don't HAVE to get that crazy. Hella makes relay sockets that clip together to make a nice neat "bank" of 2, 3, 4 etc.
Crackedback makes a nice little relay setup for headlights, but it's built for a factory harness.
You can cure a lot of troubles in one swoop by rewiring.
Some caveats 'bout Painless. Take the time to sit down with an ohmeter and pad and the book, and diagram out what all the fuses feed.
This is because there are some circuits that are marked EG "power windows" that you won't use, but you MIGHT want to use that circuit for something else. Like a fuel pump
Also, something not made clear is the "specific Mopar" "stuff." You will want to ADD the original wire to the ignition switch for IGN2, brown, the "bypass" circuit. Last I knew, this was not documented
Decide what you want to do with the bulkhead, IE keep the connector, feed wiring through, or make a plate and use a grommet
Consider UPgrading the Painless main battery feed into the interior to larger wire.
You can buy replacement Mopar connector terminals for such things as the ignition and headlight switch, etc.
And, a good way to "check as you go along" is to keep a battery nearby with a "big" lamp such as a junk turn signal lamp so you can hook that lamp in series with the battery. This will allow you to check out circuits but protect against "eff ups" that might short and damage / burn/ smoke/ EPA cleanup / and we don't want THAT LOL