SOLVED - Scroll of Transmutation and Wand of Regrowth in caves

Update: After another half dozen SoT's with Recall Inscription, I finally got a Regrowth wand. Yay!

I'm playing a cleric with Ring of Wealth, trying to get a Wand of Regrowth while farming caves. I've managed to get 7 Wands from shamans and over 30 Scrolls of Transmutation from RoW drops, but I've burned through over half of the scrolls, and even doubling their effects with Recall Inscription, I haven't gotten a Wand of Regrowth yet. Is it still possible to transmute another wand into a Wand of Regrowth?