Greetings Roman_War_Criminal!
You said “And notice the past tense “crucified” not “crucifying”. Hebrews 10:12. It’s was once and for all (for all who wanted it).”
A closer examination of the word “crucified” can be found here:
Gal 2:20 I am crucified with Christ: nevertheless I live; yet not I, but Christ liveth in me: and the life which I now live in the flesh I live by the faith of the Son of God, who loved me, and gave himself for me.
Again, we see the OMIPRESENCE of God at work. With God there is no past or future. The Apostle Paul proclaimed “I AM crucified with Christ.” Similarly, in 1Cor 2:2, Paul proclaims that the Crucified Christ is the image in his mind.
That means you “crucified “ (notice the past tense again) yourself to the cross of your sins. His sacrifice is indeed a one time deal for all past, present, and future sins of yours but that dmeant mean he’ll be sacrificed again and again and again for you. God only needs one time to get it right.
Hebrews 7:27 and for that matter the whole book of Hebrews focuses on this theme.
Of course with God there is no past or future, but Divine revelation relates to us in this real of time, and uses the term "eternal/everlasting" in distinction to it. And thus use God inhabiting eternity to justify a one time event as happening continually makes a mockery of Divine revelation, and the Lord's supper, which itself has a time limit.
Consistent with your recourse, ever event from creation to the birth of Christ to His second coming as well as the Lord's supper will be literally taking place for ever.
Instead, the Lord's supper is a commemoration of the Lord's death in which the church is to remember how the Lord's body was broken and His sinless blood poured out for them as a body, and which sacrifice the elements represent, and thus declare/proclaim His death for the body of Christ by manifesting that caring love for each other as being part of that blood-bought body in sharing food during that actual communal meal.
Which is what the only detailed description of it in the life of the church teaches . (1Cor. 11:20-34) And thus by going ahead and eating while others had none, shaming them that had not and were hungry, then the apostle said they were not actually coming together to eat the Lord's supper, but their own. Thus they were to come to fill their belly, but to effectually recognize each other as being part of that body for whom Christ died, which is the body that was the focus here, and in the next chapters.