That would be my biggest preference. Especially since if you take down P305’s merch building you can slam a few flats and stands back there (stands outlined in green). That would be a good place for a Nebulaz with a sci-fi theme. An Airrace would fit nicely back there. (both the previous and 1 more flat in the red) For family friendly toss in a space themed Convoy ride (purple). To make sure the areas remain truly separate, they should "turn" FOF's entrance so be more facing the new themed area (blue).
If you want to really be ahead of things - given how much drop tower goes down they could do a S&S double shot tower and have two different style drop towers at the same time and just take out the other one when if goes down big time. (highlighted in orange)
And then my big one:
What if you just scrap BLSC, use that land for something else, and in the space between P305 and the train tracks you put in a really long and well themed family launch coaster along the lines of Big Bear Mountain. That would open up BLSC's plot to be used for some flats and merch areas for Jungle X (personally I think that would be needed to round out that area ride wise), or you can do a family suspended coaster in there (seriously, go with flats KD). (Entrance plaza outlined in the white)
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Something like this could really flesh out the entire area rather than just have it be two coasters back there they didn't want to theme to the rest of Jungle-X.