for me, adding an accent line totally depends on the wood combination being used
a Walnut accent line was the perfect way to give space between the Spanish Cedar and Mahogany in this body
and the Wenge accent line really accented the American Cherry top and back from the Ash core in this body (seen affixed to a thick routing template)
an accent line would have been a total distraction on this body, because the Maple and Alder work so well together
for the specific wood combination in the OP's situation, I would probably pass on the accent line since you have good contrast between the two woods you're using, and they harmonize well. if it was a Maple sapwood + Walnut body core I might consider an accent line made from Mahogany, Spanish Cedar, or even Padouk
all the best,
R