Your missing the point. Again.
I’ll put this as simply as I can. The proposal is to tax payments to Mexico which are “personal transfers” - payments from a US resident to a Mexican resident for which nothing is received in return. In other words, payments of a certain character.
(There’s an - I think deliberate - vagueness in this thread about whether we are targetting all personal transfers, or just those which are made by illegal immigrants. My suspicion is that this vagueness persists because the advocates for the levy don’t like too much attention being paid to the question of what payments, exactly, are being levied. If they answer that question, they have to come up with a practical way of identifying the payments as they are made, so the levy can be imposed.)
Your proposal for imposing this levy doesn’t attempt to identify the character of the payments; it focusses entirely on the mode by which they are made.
As a person with extensive experience of drafting legislation, you’ll have spotted the problem here; the regulations don’t implement the policy. Someone making a payment of a character which you wish to levy can avoid the levy by choosing a mode of payment which is not caught by the regulations. The levy gives them a financial incentive to do so. Doing so will be perfectly legal. So what makes you think they wouldn’t do so?
The proposal in post 26 is for a 10% levy. If I paid a 10% cost to transfer funds by a particular method, I would certainly find a different method of transferring them. Wouldn’t you?