If you ever find it interesting to achieve, you could code in pressure function to water bodies. For example, if fully obscured water body is being "blocked" (a block is placed/pushed inplace of a water block), this water body could carry pressure flag "1" now.

So in general, if a closed water body (no air touch), with pressure flag "n", comes in contact with air, it will try to release n blocks of water (tick based), until the flag is "0" again, or no more air is left to contact with.

I am not sure how your air pockets work, it could be a problem. But other than that, you could start a whole new engineering era in minecraft - the hydraulic one.

P.S. - More Addons: Contacted blocks' properties: Soil-based blocks like dirt/sand etc. could have this function disabled entirely (water will try to "rise" and interact with the top air block, like it usualy does). Glass could have a limitied pressure of "5" (and a pop function?), obsidian and netherite having the biggest limit (ca. 300)...

P.S. - Addon Feature: Pressurized water bodies should leak, if exposed to air blocks DIAGONALY.

[water]-----[block]

[block]-----[air] - leak water until custom pressure or just "0"