Selling SBRs Privately

I’ve had two AR Pistols for a while now. I waited too long to sell them the simple way as just pistols and have now had them registered as SBRs due to the idiotic pistol brace ban and me not wanting to go to jail. I really have no use for them. And I know I screwed up by waiting this long but it is what it is.

I’m sure many others will fall into this category now with the brace ban too.

Can anyone tell me the easiest way to sell these things privately? I assume a form 4 and months of waiting will be the answer, but wanted to ask for some advice here first.

Could an FFL simplify this process for me?

Any advice is greatly appreciated!