I got flamed for this a few years ago but I don't put money in the collection basket precisely because some of it goes to the Bishops. I volunteer time at the parish and pay for specific things the church needs. Also I consider donations to specific causes (in our case an orphanage & school) to be our way of tithing.
I also don't put money in the collection basket. But I do contribute to the Church, albeit by specific donations to particular churches and/or organizations.
Generally, I send checks to Mater Ecclesiae Church in Berlin, NJ of which I am an out-of-town parishioner. This is a all Indult Diocesan Parish. I also send money from time to time to the FSSP.
As an accountant, I can advise you that the one way to legally ensure that none of our money goes to the bishops is to put restrictions on the Memo line of our checks. So, for Mater Ecclesiae, I also put a note saying "Donation Restricted to Parish expenses or something similar." All of my FSSP donations are usually specifically for seminary costs.