An LD_PRELOAD approach would be useful for working around that flavour of certificate 'pinning' where the cert files are embedded in the application rather read

An LD_PRELOAD approach would be useful for working around that flavour of certificate 'pinning' where the cert files are embedded in the application rather read from the filesystem. I don't know how common that is compared to the other pinning methods (public key pinning, hashing) but maybe you could make it work for those also. I guess you'd have to implement it for each individual library but does any other (free) mitm proxy offer this feature?