Strategies for onlining project with Split Screen?

I'm currently onlining a music video that features several split screen sequences (2 and 3 shots).

Footage is Red shot cinemascope anamorphic and I am mastering in a letterboxed 1080 timeline

For maximum flexibility I want to be able to zoom and reposition the shots within the split screen (which means a simple window with an alpha output wont work).

A workable, but cumbersome strategy I've come up with is:

Render out various mattes from after effects (ie 2_split_left, 2_split_right, three_split_mid etc)

Add these to the particular shots (tedious, annoying not having access to ALL mattes on a clip level, as you do in track mode), link to alpha output

Turning off "lock matte" in Key / External Matte

Setting output blanking to 286 top 794 bottom


However if anyone has a more elegant solution I would love to hear it!

You could do the split screens in a more appropriate app, burn in the repos and then use power windows to grade seperatly, you could even export a matte for the windows since you'll know where they'll be. Use RGB mattes to get multiple mattes within a single video matte file and save yourself some wrangling,

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