So, what's the official
universalist stance?
I don't know if this is official but one can lose their salvation from harmful things in this life should they get involved in all manner of sin.
But even should they lose their salvation from those harmful things they cannot lose their allotment of eonian life which is freely given and is not earned so cannot be un-earned. It is gratuitously given.

...
*For by grace are you saved and that not of yourselves, lest any man should boast.
*For the gifts and calling of God are without repentance
*But if it is by grace, it is no longer on the basis of works, otherwise grace is no longer grace
*Being confident of this very thing, that he which hath begun a good work in you will perform it unto the day of Jesus Christ
*Who shall also confirm you unto the end, that ye may be blameless in the day of our Lord Jesus Christ
*We love Him because He first loved us
*You did not choose Me, I chose you
*[God] the Author and Finisher of our salvation
*He will keep that which I've committed unto Him against that day
*Not of works, lest any man should boast
*For we are his workmanship, created in Christ Jesus unto good works, which God hath before ordained that we should walk in them
*But to the one who does not work, but believes in Him who justifies the ungodly, his faith is reckoned as righteousness
*therefore having been justified by faith, we have peace with God through our Lord Jesus Christ
*For Christ is the end of the law for righteousness to everyone who believes
*Moreover whom he did predestinate, them he also called: and whom he called, them he also justified: and whom he justified, them he also glorified
*it is finished
*And this is the Father's will which hath sent me, that of all which he hath given me I should lose nothing, but should raise it up again at the last day
*Who can separate us...? For I am persuaded, that neither death, nor life, nor angels, nor principalities, nor powers, nor things present, nor things to come, Nor height, nor depth, nor any other creature, shall be able to separate us from the love of God, which is in Christ Jesus our Lord
*So, for those God saves now (and all He will save later), what can we personally do, or any other thing do to take back or negate God's calling, His gift of salvation? What can separate us? "nor things present, nor things to come,...nor any other creature". Can we possibly lose some rewards and special positions of honor to serve, and have some of our works not of the Spirit burned/face destruction? Apparently 'yes', but IMO, that's different than salvation/being saved. That is a free gift, and
God seals those He saves with His Holy Spirit of promise (John 14:16) .
Let's give God credit for knowing what He's doing, and being able to do it

. We serve a MIGHTY God, and the end of the Lord is full of mercy!