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The Catechism of Trent provides the solution to your interpretive dilemma:

Regarding Infant Baptism

"Since infant children have no other means of salvation except Baptism, we may easily understand how grievously those persons sin who permit them to remain without the grace of the Sacrament longer than necessity may require, particularly at an age so tender as to be exposed to numberless dangers of death."

Regarding Adult Baptism

"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."

The Church, in its gold standard Catechism, written by the same theologians who wrote the Council of Trent decrees, interpreted the phrase "aut ejus voto" as you say that the "BoDers" do, namely that "either one suffices" in the case of adults.

The Catechism of Trent provides the solution to your interpretive dilemma:

Regarding Infant Baptism

"Since infant children have no other means of salvation except Baptism, we may easily understand how grievously those persons sin who permit them to remain without the grace of the Sacrament longer than necessity may require, particularly at an age so tender as to be exposed to numberless dangers of death."

Regarding Adult Baptism

"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."

The Church, in its gold standard Catechism, written by the same theologians who wrote the Council of Trent decrees, interpreted the phrase "aut ejus voto" as you say that the "BoDers" do, namely that "either one suffices" in the case of adults.

The Catechism of Trent provides the solution to your interpretive dilemma:

Regarding Infant Baptism

"Since infant children have no other means of salvation except Baptism, we may easily understand how grievously those persons sin who permit them to remain without the grace of the Sacrament longer than necessity may require, particularly at an age so tender as to be exposed to numberless dangers of death."

Regarding Adult Baptism

"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."

The Church, in its gold standard Catechism, written by the same theologians who wrote the Council of Trent decrees, interpreted the phrase "aut ejus voto" as you say that the "BoDers" do, namely that "either one suffices" in the case of adults.

Nay, this delay seems to be attended with some advantages. And first, since the Church must take particular
care that none approach this Sacrament through hypocrisy and dissimulation, the intentions of such as seek Baptism, are better examined and ascertained. Hence it is that we read in the decrees of ancient Councils that Jєωιѕн converts to the Catholic faith, before admission to Baptism, should spend some months in the ranks of the catechumens.

Furthermore, the candidate for Baptism is thus better instructed in the doctrine of the faith which he is to
profess, and in the practices of the Christian life. Finally, when Baptism is administered to adults with solemn
ceremonies on the appointed days of Easter and Pentecost only greater religious reverence is shown to the
Sacrament.