That kind of goes with another interpretation that I have heard. It would not have to be a physical mark. Forehead = thought. Hand = deed.
Yes, you are correct.
The MOTB is about worship and commandment keeping. And, Rev 14:7 makes it very clear which one that is. That commandment is God’s everlasting covenant with His people and it will be His seal on our foreheads at that time. Everyone gets a mark. It’s either the MOTB or the seal of God. Daniel knew it and so did John...The greatest abomination.