Some thoughts besides NAC and bromelain: Pine needle tea, star anise (I use drops of extract in my coffee, but I could not tell you if that is effective), fennel and licorice (glycyrrhiza glare- which can have effects on heart rhythm so be careful).
https://plants.ces.ncsu.edu/plants/glycyrrhiza-glabra/
Quote from above reference: "Plants with similar flavoring but not botanically related are anise, fennel, and star anise. The sweet compound is glycyrrhizin and is 50 to 170 times more sweet than sugar (sucrose). The extract has antiviral, anti-inflammatory, antioxidant, antimicrobial and antimutagenic properties."
I'm not sure any of the above will help with the mRNA jabs, but they seem credible approaches based on information I've seen especially from Natural News (Mike Adams). A lot of these things can be foraged or found in a health food store or supermarket. Best bet of course is not to take a jab!