Trent is not the end all, be all. We don't belong to the "Church of Trent". There's more to Catholicism than just this council. In this case, you're too narrow focused.
Amazing.
I am attempting to stay with the topic of this thread and trying to stay narrow focused.
Trent, arguably the greatest of all the Councils of the Church did not leave anything about the justification of the unbaptized unfinished. It's all in there.
I will keep this as simple as possible and ask a few simple questions,
1) What does this phrase mean to you:
[justification] cannot be effected without the laver of regeneration.
If it does not mean no sacrament = no justification, then explain what it does mean.
2) If you answered it means no sacrament = no justification, then explain why that meaning changes with the addition of "or the desire thereof, as it is written...."