Bare byte decoding and French characters

Currently, our ASM policies are configured with bare byte decoding check activated. However, this poses problems, as some of our legitimate French pages are flagged with this error. Specifically, it complains about vowels with accents (like à ) which are not part of the ASCII character set (the policy is UTF-8)

Is there a way I can prevent these errors appearing in our logs without deactivating the bare byte decoding check? Like a whitelist of characters?