How to do a locked split-screen between two different video tracks

I'm creating two time-lapse videos and then I'm planning to to play them side-by-side in one sequence.
The way I was planning to do this was to scoot one video track over using the "center" tool in the motion panel, and then crop it on its right-hand edge to reveal the other video track beneath.
The problem with doing this however is that, as the camera gets bumped or moved slightly as the months go on, and I then have to cut and reposition the "center" location for the clip, I have to then adjust the amount of crop on that video clip since I've moved its position. This means the center split-screen location keeps changing as I move the video around.
Is there a way where I can just lock the split screen smack in the middle of the frame as I tinker with each side of the frame (video track) independently? I tried adding a split-screen transition in the very beginning to the top track, but I can't make cuts on a transition to then adjust the motion attributes.
Any ideas on how to simplify this process would really be appreciated. Originally, I thought there was no easier way to do this, but I was so blown away by all the answers to my motion effects question today (and all the things I never knew about FCP) that I thought it wouldn't hurt to see if someone out there had one more ace up their sleeve. If not, I'll assume this is one of those things that can't be simplified anymore than what I'm doing.
Thanks again guys,
Chris

Though David's Motion Tracking suggestion would eliminate alot of later finagling, you could try something similar to Reink's, without using Photoshop.
Try this...
1. In a seperate timeline, drop a Matte/Color Solid into the new timeline (using dropdown at bottom right of Viewer window).
2. Dbl-click the color solid, click on Controls tab and set Parameters as H/0, S/0, B/100. Then click the Motion tab/Crop Right-50.
3. Click the Viewer's Video tab and go to Export/QTConversion/Still Image (png) and name it something like WhiteMatte_CropR50.
4. Import that into your project.
5. Now with your two timelapse clips on V1 and V2 with in/out points at head/tails and both tracks highlighted...'Nest' the sequence...Main Menu/Sequence/Nest Item(s).
6. Next, with the nested sequence active (single clip will look light purple)...option-double click on it and and drop an Image Mask Filter on it, then drag the WhiteMatte.png clip into the 'image well' (little box that has a question mark in it). Keep the channel on Luminance.
7. Now, if you dbl-click the nest, it will open it's host sequence, that you can do your 'Motion Tab/Centering' on, without affecting the 50% split down the middle.
May seem like alot of work, but it's not really.
K
p.s...there are probably other ways to do this as well.

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