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-Attach a button to the conversion gel dropper
-Make the surface(s) that the laser points onto accessible but only from the lower level. The idea is to leave a portal there, stand on the gel button, place a portal beneath the dropper, let the gel go through, then place the portal you just placed under the dropper on the wall so the gel shoots onto the surface beneath the laser note. Then place that same portal there, go through to access the light bridge area, and the rest of the solution is the same.
Here's a run of what this could look like.