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As you probably know, George Howard's Hebrew Gospel of Matthew 28:19 only has the word "Go" and a Coptic manuscript also supports this reading.
See Budge, E. A. Wallis. Coptic Texts, Volume V: Miscellaneous Coptic Texts . . . London: Museum, 1915, p. 637.
I believe a better wording of that text would be "Go to them".
I don't think that any manuscripts are available of the Syriac original of Tatian's Diatessaron (although there now appears to be a translation of Ephraim's Syriac commentary available). Based on the available translations, however, I am not sure we can find support for the first part of Matthew 28:19. The Diatessaron borrows from John and Mark for §55:5 and skips to Matthew 28:19b in §55:6:
5 Go now into all the world, and preach my gospel in all the creation [John 20:21b, Mark 16:15b];
6 and teach all the peoples, and baptize them in the name of the Father and the Son and the Holy Spirit; and teach them to keep all whatsoever I commanded you [Matthew 28:19b]
