At least here in the USA most insurance companies cover custom ear plugs that support filters.

I paid $200 out of pocket to have the molds made and get 3 sets of filters.

Now I own the mould file and coils purchase new ones out of pocket or have insurance cover a new pair.

I realize your ask was related to some plugs being too expensive BUT maybe my option of subsidized studio quality plugs may help (someone)

I’m going to come at this from the wrong angle and suggest filtered earplugs, the flavor of which I’m currently using are these “motorcycle” oriented ones which are indeed also the ones I use when riding.

There are a zillion variants and rebands of these, and if they all look the same to you that’s because you’re right, and they are. Variants exist being billed as “concert” or “high fidelity” earplugs, or shooter’s earplugs, or whatever the hell else. I noticed a few weeks ago Cabelas/Bass Pro is selling a set of plugs identical to mine but in different packaging and marketed towards shooters rather than riders. They all work the same way with a little plastic puck inserted in the middle that’s ventilated, and with a tiny diaphragm in it.

Regardless of flavor, the deal with these is that they dampen sound quite a bit with the key distinction of not making you completely deaf while you’re wearing them. They also do so while remaining discreet and not making you look like a berk, or as if you’ve got Airpods in. I’ve taken to using these for all tasks where I need hearing protection or want quiet, since I almost always have them on me anyway and they’re the least uncomfortable type of earplugs I’ve found so far for long term use that don’t also cost a mint. They’re washable and my first pair has survived being worn basically every day inside my helmet for about three years running.