So, I updated Xtreams-Transforms to fit Cincom public store version 52.
Then I added Xtreams-SqueakTextConverter to provide a DialectConverter.
I didn't name it Xtreams-SqueakEncoder because I'd like to let room
for cleaner classes.
I didn't make any effort to support backup/restore State

My version can now execute:

(((ByteArray new writing encoding: 'utf8')
	nextPutAll: 'àé'; conclusion)
	 reading encoding: 'utf8') rest

Cheers

Nicolas