Recipe for infusing transmuted back items
Unsure of exactly what your situation is, but you could
A. Use a transmute crystal to put the skin a different backpiece that has the stats you want (~40gems or ~4g & Seconded Backpiece)
B. Use a transmute splitter to remove the skin from the old back piece (300gem or ~23g)
C. Just buy a new Desert Rose skin (~24g)