In a letter to Yitzchak, Dr. Ezra Chwat writes:
"A most recent finding is the rediscovery of ms HUC 795 - the complete Birkat HaHamma attributed to the HIDA. Upon our request, the staff of HUC found after it was misplaced at least 30 years ago, and have generously sent us color scans (it's illuminated). You can post this note if you wish."
Somewhat related a Yiddish sefer on Birkat HaChammah (1897) has recently been placed online and can be found here.