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They don't use a texture. Yes, the glass texture needs blending additive in the TXI in order for the transparency to render correctly.

Everything was like that. But due to the quality of the texture, this was not noticeable.

It would require editing all the VFX nodes, but sure, it's possible. The underwater suit you pictured uses fx_bubble. I could mess around with trying the settings it uses. The other option would be to replace the chunk model for the current bubbles, fx_koltobub, with an actual spherical mesh rather than the pointy cube it uses currently. I'm curious as to what changed though, as I don't recall the vanilla bubbles being that opaque and obvious. I didn't touch the VFX nodes in the room model.