Alternate Start

I highly, highly recommend using TinyManticore's awesome alternate start mod: Start Me Up.  It is AMAZING.  Ah. Maze. Ing.  It even changes the player dialogue to reflect your origins!  That's what I'm using now myself, rather than this quick-and-dirty fix.  Go try Start Me Up and remember to leave TinyManticore an endorsement!

SPOILER ALERT!  The mod description contains spoilers for the main quest.

These save files are made with the main quest completed to the point where you

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kill Kellogg.  Nick Valentine has been rescued, but there's no contact with Codsworth, and no exploration of Sanctuary.  The only quest completed is the main quest chain, up to Reunions.  Kellogg's body is still in Fort Hagen Command Center, with all loot, if you ever want to do the rest of the chain.  NPCs will reference the Brotherhood of Steel, but they won't be present in the Wasteland until you reenter Fort Hagen, then exit via the roof.

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The character has three levels (from required quests) and no perks selected.

The saves were made without mods, and should be completely safe to swap into your setup.

To customize your character, use the following console commands:

• []player.sexchange       Changes player character between male and female models.   []ShowLooksMenu 14 1 Allows you to change your character appearance.  "14" is the player character ID.  Or, you can visit the surgeon.
• ShowSPECIALMenu     Change name and SPECIAL points.

The Gorgeous Vault Girl face from one of the Back To Reality saves is by Cedaie, and the original can be found here. The Back To Reality start is inspired by the Red Dwarf episode of the same name.  The Grimm start is based on the television show of the same name.  I loved it; too bad it was cancelled after the second season. Find more here:  Murderboarding.

Starts currently included; BACK TO REALITY.  (Gorgeous Vault Girl and Vanilla) DRIFTER.  (Vanilla) GRIMM. (Vanilla)