I took a look at the Holy Sword that you get from the Holy Sword spell. It's destroyed on logout, so this isn't infinitely abuseable, but it can make a few hours of massive sillyness before you log out.

Step 1: Have a lvl 20 Paladin that you want to True Reincarnate.

Step 2: Wait until the beginning of a day when you're going to have at least a few hours of play to level up your character.

Step 3: Cast Holy Sword (or two if you want dual Wield Khopesh with Dagger or something like that)

Step 4: True Reincarnate and enjoy your +5 Holy Sword until you log out because the weapon has no ML....

At least a few early levels are going to be essentially free.

Edit: If someone is going to TR their Paladin, could you check to see if this actually works?