Stubborn, I didn't miss it.
But again you are confusing terms. You are talking about unforgiven sins but the topic is THE Unforgivable sin.
Jesus Himself tells us in Chapter12 of Matthew's Gospel which addresses the
Intransigence of those whited sepulchres, the Pharisees:
 Therefore I say to you: Every sin and blasphemy shall be forgiven men, but the blasphemy of the Spirit shall not be forgiven.  And whosoever shall speak a word against the Son of man, it shall be forgiven him: but he that shall speak against the Holy Ghost, it shall not be forgiven him, neither in this world, nor in the world to come.  Either make the tree good and its fruit good: or make the tree evil, and its fruit evil. For by the fruit the tree is known.  O generation of vipers, how can you speak good things, whereas you are evil? for out of the abundance of the heart the mouth speaketh. A good man out of a good treasure bringeth forth good things: and an evil man out of an evil treasure bringeth forth evil things.
So we see there is only one unforgivable sin (THE sin). These Pharisees, in this chapter alone, were constantly watching out for ways to trip Him up and trap Him in order to kill him, in they finally succeeded, as we know. They could have repented at any time but they chose final impenitence.
I repeat that it would be a very slim chance that a person could survive a suicide just long enough to repent, (but nevertheless possible) and it would be presumptious to bank on it. Presumption on God's mercy would be a sin in itself to compound the mortal sin of suicide.