To file in “unexpected finds”: With no apparent relationship to the rest of the text on the page, the Georgian mxedruli alphabet (along with Armenian) is found in the large outer margin of a Syriac manuscript from Jerusalem containing the Lexicon attributed to Eudochus, &c. (SMMJ 295, perh. 19th cent.).
Here “Georgian” in Syriac is gergānāytā. The writing begins with ქ, presumably for ქრისტე “Christ!”, and ends with ამ(ე)ნ “Amen”. The handwriting is not bad at all. There is no ჳ between the ტ and უ, but the other four letters obsolete in later Georgian (ჱ, ჲ, ჴ, ჵ) are here.