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A little harder to do with the present machining as I would need to remove extra material to create the bumps, but for a mold it's exactly what I intend to do.
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But you're already removing material from the base to make the jets longer. You can forget about feature tapering to avoid a tool change, and you only need to leave some small spots of the base with the original thickness.
It's a good warning that of the srinkage, and that can be easily solved making linear shapes disposed in an axial orientation, alowing for srinking, and even termal expansion during use, without loosing alignment. The groove on the base just need to be a bit longer than the shape on the middle plate.
I marked with blue in this pic a suitable placement that can work both on the milled and molded versions. It just need a little cleareance from the o'ring, but the space available seems enough.