You're right, I must be missing your point, because I don't really see why this dual role sounds more unnatural to you than six roles at once (Psalm 18:2). If I had to hazard a guess, however, I would conjecture that it sounds unnatural to you in virtue of 2,000 years of immaterialistic theology whereas I myself concur with the church father Tertullian (who invented the word Trinity) that even God Himself is physical. On my assumptions it is only natural for God to play multiple physical roles at once. I'll provide just three examples (but I'm not really going to try offer any apodictic proof because it would be way off topic).
(1) In my view, at the last supper, God assumed the forms of bread, wine - and even the CUP containing the wine. (Please don't mistake my view for the converse process called transubstantiaton where ordinary elements supposedly become God).
(2) "They all ate the same spiritual food and drank the same spiritual drink; for they drank from the spiritual rock that ACCOMPANIED them, and that rock was Christ" (1Cor 10:3-4). They all drank Christ (12:13). He was both the Rock and the drink (in my opinion).
(3) In my opinion, God is all of the following: a figure seated on a throne, the Fire emanating from the throne, the radiant Face whose Light illuminates the heavenly city, the clothing garbing the figure - and even the throne itself! Relevant verses here include Ex 24:9,
Isaiah 6:1, Ezek 1:26-27, Dan 7:9-11, Rev 1:14-16.