I’ll throw out another idea, if you’d like to honour them without using their names. What about a name that means father to honour both your father figure and your dad (or a names that means uncle, if you prefer to focus only on him)? I don’t really know your naming style, but it sounds like you prefer more unique names. Here are some names that mean father that I found to be unique and cool. (All sourced from the advanced search function on Nameberry.)
Abbott (“father”)
Artan (“little bear; golden; little father”)
Avi ("father)
Axel (“father of peace”, kind of cool in that you’re establishing a peaceful relationship with your father now, something you’ve already had with your uncle)
Eviatar (“my father is great”)
Liav (“my father”)
Rami (“wise protector; father of multitudes; archer; pleasing”)
Also:
Eames (“son of the uncle”)
Zio (“uncle”)