I would mention, Cameron, that in Scripture, I believe I've observed the word "saved" being used in different ways: one to denote spiritual status (as a noun); another to denote an action (as a verb). I believe that in 10:9 it is used as a verb in the future tense. I think the reason for that is to describe literally being saved (escaping) from God's wrath on the last day, and not as a change to spiritual status. Of course, a change to spiritual status must have preceded it at some point, but I don't think that is what is referred to there. I base this upon the following verses (below). Notice that per 5:9, they, having already been justified by Christ's blood (saved), "shall be" (future) saved from His wrath. Also notice that in 10:9 the same "shalt be" exists - again, in a future tense with same word used between the two verses (even though it is spelled a little differently). I believe it is referring to being saved (escaping) God wrath on the last day
It also seems to me, that should we need to do something to become saved and should we do it, then by definition, salvation must occur immediately upon the doing and not at some future point in time, so to be consistent, the tenses between the two should be the same, not different.
[Rom 5:9 KJV] 9 Much more then, being now
justified by his blood, we shall be saved from wrath through him.
[Rom 10:9 KJV] 9 That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead,
thou shalt be saved.
In the following verses, I believe we can see how scripture depicts an actual change to spiritual status/state when it occurs. It is depicted as "are saved" and "are ye saved" - both in the present tense, not "shall be saved" in a future tense.
[Eph 2:5, 8 KJV]
5 Even when we were dead in sins, hath quickened us together with Christ, (by grace ye
are saved
...
8 For by grace
are ye saved through faith; and that not of yourselves: [it is] the gift of God:
In addition to the requirements for salvation as described by Rom 10:9 (above ) - that it actually means a change to spiritual state or status, then the below would then also have to be factored-in as requirements for changing spiritual status. With each being somewhat different from the other, a conflict would arise as to how one actually does become saved because their requirements would be different, and then man would have to mix and match different actions in order to acquire salvation
[Mar 16:16 KJV] 16 He that
believeth and is baptized shall be saved; but he that believeth not shall be damned.
[Jhn 10:9 KJV] 9 I am the door: by me
if any man enter in, he shall be saved, and shall go in and out, and find pasture.
[Act 15:11 KJV] 11 But we believe that
through the grace of the Lord Jesus Christ we shall be saved, even as they.
[Act 16:31 KJV] 31 And they said,
Believe on the Lord Jesus Christ, and thou shalt be saved, and thy house.
[Rom 10:13 KJV] 13 For whosoever shall
call upon the name of the Lord shall be saved.
Just thought I'd mention these other ways of looking at it - hope it makes sense. If not let me know and I'll try to clarify.