The questions from the reader are as follows: Are you saying that you can approach the Trinity without Jesus? Is not Jesus our portal to the Trinity? How do you conceive of the Trinity? When you pray, who/what are you with?
The initial answer: Perhaps I will write more in depth on this topic, although my other readers understand the Trinity, so it might be redundant for them. If you have a Catechism of the Catholic Church or could borrow one from a parish, please read about the Trinity in sections 232-256 (approx.). You will find that Jesus is the Second Person of the Holy Trinity; the Father is the First Person, and the Holy Spirit is the Third Person. However, they are Three in One. All three Persons would be considered portals of prayer and interaction, yet each have more distinct functions. I can't say that any of the Persons are portals "to the Trinity," for they ARE the Trinity.
Another good resource that is fairly complete and detailed is Msgr. Adolphe Tanquerey's The Spiritual Life: A Treatise on Ascetical and Mystical Theology. Tan publishes a paperbound copy, but online you may be able to purchase a used hardbound. The Blessed Trinity (Three Divine Persons) is detailed in sections 90-101. Specifically, when we pray, we are within the Trinity, which by grace draws us in by varying degrees dependent upon the state of our souls in any given moment. We are in prayer within the Three Divine Persons of the One Trinity: Father, Son and Holy Spirit. While brief, I hope this helps. I highly recommend the other reading, though. Every now and then I re-read from books I have here, as I feel it helps me always to keep learning. I really like Garrigou-Lagrange's writings. He has a couple volumes just on the Holy Trinity. There's much out there to read by proven theologians and makes learning more about the Faith a joy for us.
I will continue ancillary reading in books on the Holy Spirit, since personally in my own Protestant faith earlier years provided mostly learning about Jesus and God the Father. I thank the questioner, for this is providing me with the next foci of personal learning and growth as well as perhaps some assistance to readers who may not have easy access to some of the books or time for studying the topic. I will share, hopefully, simply and warmly, as between personable seekers of God, rather than in a scholarly tone. I personally prefer personable!
These few words from The Catechism of the Catholic Church (while there is much more others may read on their own), are what I will ponder this morning while doing some hermitage tasks:
"The Faith of all Christians rests on the Trinity;" and, "The whole history of salvation is identical with the history of the way and the means by which the one true God, Father, Son and Holy Spirit, reveals himself to men 'and reconciles and unites with himself those who turn away from sin.'" [232; 234]