I would stay in the parish in which God placed me, which is my territorial parish.
I am discerning a call to the diaconate in the diocese where I live. If ordained, I would first obey my bishop and the pastor of the parish in which I am placed. If the SSPX were regularized and the pastor or bishop said “Go there” I would go. If the pastor or bishop said “Do not go there” then I would not go.
There is an FSSP parish nearby so I do not forsee the need to go to an SSPX chapel even if there was one nearby. I do not hear anyone asking for a Tridentine Mass at my parish so there probably wouldn’t be the need anyway.
Quite frankly, knowing what I know about deacons - who they are and what they do - being trained on the Tridentine Mass is probably number 9,857 on their list of important things to do, right after sacramental records, annulment requests, prison ministry, homebound ministry, hospice ministry, chaplain to the boy scouts, earning a paycheck, cooking dinner for the kids, getting the oil changed in the car., etc., etc., etc.
No disrespect is meant toward the SSPX or the Tridentine Mass. I just don’t see the need for it in the tiny little part of the Church which I can see.
-Tim-