Ah, sorry, DH is a UK citizen, working and earning in the UK, never resided in the U.S.
I'll take that as DH is not a US person.
FBAR filing and filing a tax return are not interrelated. One is not dependent on the other.
Some may file a tax return, but not an FBAR. Some may file an FBAR, but not a tax return. Many file both.
If all your income (including interest) is below the yearly required 1040 tax filing threshold (I assume you'll want to file MFS [married filing separate]), then you do not need to file a tax return. If you have signature authority over an aggregate of all accounts with more than $10,000, then you will need to file an FBAR.
No need for any programme, Streamlined or otherwise, if you have no obligation to file a tax return. FBAR can be filed for past years, provided you have reasonable cause as to why you haven't filed in the past. "I didn't know" is included in the dropdown answers. Or, you may want to simply file FBARS going forward, but it is a risk.
The FATCA form is only required if you are required to file a tax return, and the aggregate amounts total over the relevant FATCA threshold. (So, not required to file a return = no FATCA form.)