An extensive group of papers on the subject:
https://www.ncbi.nlm.nih.gov/pmc/?term=Long%20covid%20spike
You could try enteric nattokinase, it’s hypothesized to work because it dissolves fibrin. It’s a protein so it needs to be protected from stomach acids:
https://solaray.com/products/nattokinase
It’s a shot in the dark because its bioavailability is in question, but if all else fails…
I have tried nattokinase but it did nothing for me. I used it for about 45 days with no results. But I will link both those URLs you shared. Thank you.