If something is possible, yes, it "can" happen.
Therefore, the answer is yes.
Because this is the divine revelation of Our Lord Who said in no uncertain terms that it "cannot" happen, and Trent literally referenced and applied those words saying it "cannot" happen, I do not understand how you can say there is a possibility that it "can" happen.
You then quoted Trent's catechism:
On adults, however, the Church has not been accustomed to confer the Sacrament of Baptism at once, but has ordained that it be deferred for a certain time. The delay is not attended with the same danger as in the case of infants, which we have already mentioned; should any unforeseen accident make it impossible for adults to be washed in the salutary waters, their intention and determination to receive Baptism and their repentance for past sins, will avail them to grace and righteousness
Ok, the catechism first off states that there is no danger of death involved, if there were, then the adult must be be baptized asap like infants who are more prone shall we say, to die at any time. However, when there actually *is* the danger of death, the very next chapter teaches that "In Case Of Necessity Adults May Be Baptized At Once."
To continue with the first part where it says:
"should any unforeseen accident make it impossible for adults to be washed in the salutary waters, their intention and determination to receive Baptism and their repentance for past sins, will avail them to grace and righteousness."
Note that
"grace and righteousness" are attributes of the living, not the dead. Neither Trent nor it's catechism are talking about the attainment of salvation here, which is an attribute of the dead, not the living, which means quoting this part of the catechism to show it's contrariness to John 3:5 and Trent's application of it, is a non sequitur.
Also note that there is no mention of accidental death, only an "unforeseen accident," which could mean literally any unforeseen event *except death* that impedes the catechumen from receiving the sacrament as planned, anything from the priest having to reschedule due to an emergency, to the catechumen's car not starting, to whatever other "unforeseen accident" you can think of, except unforeseen accidental death.