You have not specified which particular segment of Protestantism you are a part of, but here are a wide variety of Protestant scholars who recognize that there is a connection between Mt. 16:18-19 and Is. 22:20-22.
I’m not so much interested in the misinterpretation of a lot of so called scholars. What I am interested in is what the bible says on the subject and in particular what Peter says.
1Peter2
4 To whom coming, as unto a living stone, disallowed indeed of men, but chosen of God, and precious,
5 Ye also, as lively stones, are built up a spiritual house, an holy priesthood, to offer up spiritual sacrifices, acceptable to God by Jesus Christ.
6 Wherefore also it is contained in the scripture, Behold, I lay in Sion a chief corner stone, elect, precious: and he that believeth on him shall not be confounded.
7 Unto you therefore which believe he is precious: but unto them which be disobedient, the stone which the builders disallowed, the same is made the head of the corner,
8 And a stone of stumbling, and a rock (petrah) of offence, even to them which stumble at the word, being disobedient: whereunto also they were appointed.
Here Peter himself says that Jesus is the rock (petrah). The word used in Matt 16:18 And I say also unto thee, That thou art Peter, and upon this rock (petrah) I will build my church; and the gates of hell shall not prevail against it.
Peter also refers to Isaiah 8:
13 Sanctify the Lord of hosts himself; and let him be your fear, and let him be your dread.
14 And he shall be for a sanctuary; but for a stone of stumbling and for a rock of offence to both the houses of Israel, for a gin and for a snare to the inhabitants of Jerusalem.
15 And many among them shall stumble, and fall, and be broken, and be snared, and be taken.
Can there be any doubt that Peter himself is telling us that it is Christ who is the rock (petrah) upon which He builds His church?