Your advice was really helpful.
Playing around with DefaultAlgorithmNameFinder, I ran into the Error -
java.lang.LinkageError: loader constraint violation: when resolving field "id_TA_ECDSA_SHA_1"
the class loader (instance of com/*****/*****/core/server/*****ClassLoader) of the referring class
, org/bouncycastle/asn1/eac/EACObjectIdentifiers, and the class loader (instance of java/net/URLClassLoader) for the field's resolved type
, org/bouncycastle/asn1/ASN1ObjectIdentifier, have different Class objects for that type
Further investigation revealed that there were older versions lying around (1.38, in fact).
Thanks a TON!