Here is a proposal to 2nd Thessalonians 2:13, keeping, as requested by the OP, context. Let us see if it has anything to do with Calvin.
We know that there are various "salvations" in the Bible. Peter was "saved" from sinking after he followed the Lord's instructions about walking on water. 1st Timothy 2:15 says a woman is "saved" by childbearing. This is very different from being saved as in Ephesians 2:8. So what if we take the advice of the OP and put the verse in context.
The context of 2nd Thessalonians was that in the midst of severe persecution (1:4), some had appeared and said that the Great Tribulation had started and that they had missed the escape from God's wrath (1:7-10, 2:2)
The context of Chapter 2 is our "gathering to him" in verse 1 and that the things that must first be have not happened yet.
That means that the "salvation" mentioned in verse 13 has to do with being "saved" from the coming dreadful events on earth - NOT to do with escaping the Lake of Fire and/or losing one's salvation or not.
- Verse 1 sets the immediate context, "...the coming of our Lord Jesus Christ, and by our gathering together unto him"
- Verse 2 says that "the Day of CHRIST" is not yet at hand. This is in contrast to the "the Day of the LORD." In all the usages of these two phrases in the whole New Testament, the "DAY of CHRIST" concerns the "gathering and judging of the CHURCH. "The DAY of the LORD" on the other hand is that DAY when God's wrath is poured out on the nations. That means that the day when we, the Church, are gathered to the clouds and the judgement Seat of Christ (Rom.14:10; 2nd Cor.5:10) has not yet come.
- Verse 3 admonishes, "Let no man deceive you by any means: for that day shall not come, except ...
- Verse 4 - 9 set forth events that must happen BEFORE the DAY of CHRIST and our gathering to Him
- Verse 10 speaks of those NOT SAVED by the gospel and their destruction.
Now, verse 13 starts with a "BUT WE ..." By using "BUT", Paul CONTRASTS the fate of the unbeliever from the fate of Christians at Thessaloniki. And the use of "WE" Paul CONTRASTS those who will
perish from those who will be
saved. But what shall they perish from??? It is NOT HELL. It is the GREAT TRIBULATION! They who perish are those LIVING at the end of this age who BELIEVE THE DECEPTION OF THE MAN OF LAWLESSNESS!
The SALVATION of verse 13 is not the
salvation of Ephesians 2:8!
It is the salvation from the Great Tribulation! And how is this salvation effected? BY OUR GATHERING TO CHRIST. If it was the "DAY of the LORD" then we would NOT be gathered to Him. He would COME TO US for Armageddon is ON EARTH. It is the "DAY of CHRIST" that comes BEFORE the "DAY of the LORD".
And what is more, the day we are "gathered" is the day when we,
"... obtain of the glory of our Lord Jesus Christ" (v.14). When is this day? RESURRECTION DAY (1st Cor.15:35, 40-45, 1st Jn.3:2). And resurrection day is the day of RAPTURE (1st Thess.4:15-17) - our gathering to Him in the clouds. And both 1st Thessalonians 4:18 AND verse 17 of our text end with COMFORT!!! Why? Because the promise is that we are NOT APPOINTED TO WRATH - BUT SALVATION (1st Thess.5:9). What "wrath" - The Great Tribulation. What "salvation" - the Rapture, the "gathering of us to Him".
I propose that 2nd Thessalonians 2:13 has NOTHING to do with CALVIN or his doctrine.