If you're sending the plastic bezel out for rechrome, you should probably let them do the plastic repairs or at least ask them what adhesive and/or filler products they'll recommend. Some chemicals may react with the chroming process.
I wouldn't attempt to move the ignition switch from column to dash.
For what its worth... I built a right door mirror with long cable remote. I cut a second hole for the ignition switch bezel into my 67 rallye dash for that remote. If you went that route you would cut holes in the right door and the door jamb area but you would already have the hole for the remote.
On/off switch for stereo amplifier or just about anything placed in that switch bezel might be better than attempting to fill the big hole in the sheet metal.
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