Responsa על ברכות 80:16

I also asked [in my dream]: when we respond, during the blessing after meals, with the phrase "Blessed is He, of whose food we have eaten" - do we need to refer to the name and kingship of God, or not?¹i.e, should the formulation use one of the names of God and the word referring to God as king. See Berachot 40b:6 . The Raavad (cited in Rashba on Berakhot 54a) suggests that the reason that kingship is not recited in the this phrase of the blessing after meals is that it will be mentioned in the subsequent paragraphs. I have not found any other early sources claiming that kingship should be recited here.

Q - A and B were seated at a meal, and one type of wine was served to A, and another type to B. Can A's recitation of the blessing "Hatov Ve - Hamaytiv" release B from the obligation of reciting this benediction, and be considered as if B recited it himself?
A - A's recitation of the blessing "Hatov VeHayaytiv" does not release B from the obligation of reciting the benediction.
R. Hayyim Eliezer notes that he heard R. Meir b. Baruch state how perchance when the latter would mention G-d's name in vain, he would immediately recite: "Blessed be His name, whose glorious kingdom is forever and ever".