To clarify; The CRL in regard to canon-specific characters is in regard to items such as Boba Fett's helmet. You cannot have a helmet with the same paint job and the same dent, because this helmet is specific to that character.
Belts, holsters, weapons, etc. are allowable on custom builds.
You CAN use Obi-wan's boots on your kit. You CAN use Han's holster and DL-44. You CAN use Boba Fett's EE-3.
If you couldn't use any item that has appeared on a canon character, then the Mosin-Nagant pouches (that are used on hundreds of our OM's kits) would not be usable because they are used by a canon character (Zero in The Mandalorian). That is NOT the case, as the pouches are usable and approvable.