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Love your design. If it weren't for the weight on my son's neck, I would go ahead and print it right away!
Just a thought: According to the density table from rigid ink https://rigid.ink/blogs/news/how-many-meters-of-filament-on-a-spool you could save almost 20% in weight if you had used ABS instead of PLA (and make the parts stick with acetone instead of glue). I suspect that you have used wood or copperfill for the horn?! If so, then you could save 75% (!!) in weight and spray paint it, then seal it with ABS slurry or epoxy (e.g. XTC-3D). The latter would have the added benefit to render the mask a) waterproof and b) resistant to UV radiation.
Question: what filament have you used for the horns? Regular or some specialty PLA?