flatwounds on an acoustic?

i have an acoustic/electric conversion (or whatever you call them) on my xmas list this year. i was planning on throwing some flatwounds on it to hopefully give the tone a more upright sound. i know that it won't sound exactly like an upright cause of the shape and the concave-ity or whatever (i'm not good with terminology) but will it sound less like an acoustic and more like an upright, or vice versa? any help appreciated.