First, , I am not aware that in Lebanon we have Shia financial institutions. Such institutions serve all Lebanese, regardless if some institutions are majorly owned by a personality from one sect or the other. For example, even an institution like Qard al Hassan, you have Christians patronizing it and in turn that institution serves all Lebanese, regardless of their religion. I was in Dahiyeh once, and a christian family stopped to ask me for direction to Qard al Hassan. They're likely going there for a loan and to pledge gold. How do I know they're Christians? They're putting a cross on their necks.
You said: "as long as the Shia are dealing with dollars, no one can protect them from any sanctions".
This presumption is laughable. The dollar needs who to protect it. The dollar has long lost its value going by the debts America owes other countries. The dollar is just a brand name and nothing more. That is the only thing keeping it afloat.
Lebanon's population is made up of anything between 27% to 55% Shia (both within and outside Lebanon). All it would need from SHN to make sure the dollar is shaken is one fatwa and one sentence in one speech: that it is haram to transact in dollar. Then that would be the end of the dollar as a currency in Lebanon. We can use euro, yuan or whatever currency. This is just to make sure ntek ekhet el dollar, your crusader money. This is a measure long overdue. We almost make use of the dollar as we make use of the Lira. It is as if we are an American colony. And the godforsaken pro Zionist American govt is not happy. They're still trying to look for ways to make our lives hard for our political choices and our resolve to protect our land in DEFENSE! So therefore, it is time to also make America pay for its pro Zionist policy when talking and dealing with Lebanon. Make the dollar pay and let it disappear from circulation in Lebanon. No Shia and no Christian and no Sunni, and no Druze and no Lebanese (who has honor and dignity as Lebanese and are supporters, sympathizers, admirers, followers of the resistance) should transact in USD. Don't give it and don't take it. Ma fi ba3sah akbar min hek.