Is there any support for a Fifth Amendment argument here?

Moreover, although defendant does not explicitly rely on Fifth Amendment grounds, we perceive no support for a Fifth Amendment argument here. As we have observed, defendant freely and voluntarily waived any Fifth Amendment right he may have had; moreover, defendant's appearance and acceptance of appointed counsel on one charge does not amount to an invocation of such rights with respect to another, uncharged offense. (Connecticut v. Barrett (1987) 479 U.S. 523, 107 S.Ct. 828, 93 L.Ed.2d 920.)