Hi there,
I always think that the unknown is the biggest fear here.
My advice, download the 2019 1116 form and the instructions/worksheet, don't be too daunted and just try to fill it out as a test run.
It would even be worth you potentially paying someone to do it I guess. I'm not sure about the MFS - I always file MFJ as my wife is also a USC. However, we have no US bank accounts or anything, but for my 2019 I already received a cheque from the IRS for $2800 ($1400 per child) which I cashed into my UK HSBC account and it cleared within a few days (they say can be up to 6 weeks) and so received about £2250 for the pain of filing my own taxes. However, I taught myself and honestly believe working through and researching it first is a good first step, in a practice way.
Just be aware if you elect to use FTCs (form 1116) now over the FEIE (2555), I believe there is a period (6 years or similar?) where you are committed to that method. But again, as long as you have USC children and are earning money, I believe it is always favourable to do so ultimately.
Good luck!