EM BC/BE requirements are set by each individual institution/overlord, and they change all the time in response to a bunch of factors...including...malpractice rates going up/down based on BC/BE, insurer reimbursement hinging on BC/BE, hiring/retention easiness/difficulty leading to more/less stringent BC/BE, start/end of contract with EM provider agency, etc.
I suggest having a much more regional focus - national numbers are useless unless you're literally willing to live/work anywhere. In your shoes (I think you're an M3?) I'd pick a region or two (such as "middle 1/3 of Oregon" or "upstate Michigan, on the hand") and just identify all the hospitals and all the EM agencies serving that region. Generally a hospital that contracts with an EM agency that has no FMs listed isn't a FM-friendly ED. Go through hospital physician directories for hints on whether there are FM people staffing the ED. Google stalk the ED providers to see what residencies they did, how long ago. When you find FM docs who apparently staff EDs, reach out. Try to get some mentorship that is highly relevant to you.
For example:
1. oh hey I've gotta ski to be happy let's see what's in the PNW Cascades - that one time I broke my arm where did I go? Oh yeah Leavenworth.
2. so I google "leavenworth hospital" and then to get rid of Kansas hits I google "Leavenworth washington hospital"
3. I dig into the website and find physician lists - at the Leavenworth hospital I have to go to the ED page. I assume these lists are completely out of date and leave out a lot of docs, and I don't let this derail me because I'm sherlock effing holmes.
4. I grab those doctor names and google them, doximity them, find the FMs. also I find more hospitals this way - oh hey Leavenworth Doctor B is listed at other hospitals...and now I have a Lake Chelan hospital...bet they know a lot about burns now, fires were so bad last year...
5. ok so what trauma levels are these hospitals - I can probably get that on Wikipedia. And I'll google maps it looking for a helipad if I feel like it.
6. I start looking/guessing at regional trauma catchment - a Leavenworth doc would maybe refer to Wenatchee, a Wenatchee doc would probably refer to Harborview
7. OK now I found an FM doc who is ED medical director at one hospital and ED staff at another...and he doesn't look too old...bingo
8. now I start sending polite emails, make some polite phone calls, snail mail some letters, expect no response for weeks-months, expect maybe 10% return on investment
9. and I go for the gold: get that shadow gig, use holiday/vacation if necessary, get in there, interrogate management, interrogate providers, take copious notes. if I don't touch a single patient who cares, that's not what this is for.
Good luck!