only if I can do it in english..............
Most people, I say most, with this low of income, who qualify for a CSR plan, probably don't have the money to put into an HSA. But there are situations, especially retirees over age 59 1/2, who have low income on paper, and would want to use their IRA to fund an HSA. But, that's a whole other discussion that I can tell you in spanish someday.
I, and I think you have too, have quite a few self employed clients. They make over $100K, but after deductions they could qualify for Medicaid. I advise them to reduce their deductions above $16K to qualify for the CSR and maximize subsidy. In this situation, they can afford to contribute to an HSA account if they don't choose to enroll in a CSR plan, but they can also afford to make a decision on what is best for them.