The assertion, true in itself, that God is not limited by the Sacraments, has been much abused. We cannot use that statement to contradict Catholic teaching on salvation or grace.
We know from Catholic teaching that baptism can be given in the formal Sacrament, and in non-formal baptisms of desire or blood. We also know that forgiveness from grave sin can be obtained by perfect contrition, with at least implicit desire for Confession. A marriage of non-Christians can be merely natural, but it is not the Sacrament.
And there is no support in Catholic teaching for other Sacraments being granted apart from the conditions needed for a valid Sacrament: marriage, confirmation, holy orders, anointing of the sick, consecration of the Eucharist. So we cannot propose that some persons receive Confirmation without a priest or bishop and the other elements for a valid sacrament. Nor can we propose that God grants Sacraments apart from the conditions given in Church teaching.
The Holy Spirit dwells in all baptized persons, including baptisms of water, blood, desire, as long as they avoid actual mortal sin, and again as soon as they are forgiven for actual mortal sin. The gifts given at Confirmation are a strengthening of the gifts of the Spirit given at Baptism. Due to sin, some persons who have received Confirmation might seem less holy than others who have not been Confirmed. But only God can judge the soul.