ANSEL - wikipedia
ANSEL is not supported by recode. GEDCOM format to exchange data could have ANSEL encoding
Maybe you think what encoding is still missing, so ANSEL is a hint to add to recode.
I attach two simple GEDCOM files created in Geneweb, one exported in ANSEL mode, other in UTF-8 mode. These files could be used to test ANSEL/UTF-8 conversion.