Not a cheap option but have you thought about something like this:
https://www.acscustom.com/uk/product...ion/pro-series
I have a pair for gigs and loud places as my tinnitus became significantly worse and I needed to protect my hearing some. They came in around £200 if memory serves and I have the pro17's and where they differ from normal ear plugs is that they simply reduce the volume to more comfortable levels, all the frequencies remain (so you don't get that dull thumping from bass notes) and its just like hearing things at a reduced volume.