Of course there's a solution
The goal, as you may have ascertained, is to get gel growth to trigger both pressure plates.
However, you will need most of the rafts (not all though) to build a bridge from the first gel growth area (near the mother) to the first pressure plate.
So, in order to make a bridge from the second gel growth area to the second pressure plate...
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×you will need to clean off ALL of the rafts after the first pressure plate is triggered. Good luck doing that.
This is one of the hardest rooms in the hold, in my opinion.
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Quick links to my stuff (in case you forgot where it was):
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