This has got to be simply one of the most bonkers proposals I have heard in ages.
It is pretty obvious that US destined services from airports outside LHR are in pretty deep trouble now, Covid-19 has decimated routes, even from the likes of Manchester and with companies have realised that so much business can be done over Teams, Skype, or other electronic platforms the amount of high revenue business traffic is not likely to recover in the short to medium term, if at all.
As has been noted above, BHX has, and looks as though it still will retain excellent connectivity across numerous European and Middle Eastern hubs, and squeezed as it is between LHR and MAN stands just about zero chance of making a start up operation work, and any banker with an ounce of financial common sense wouldn't lend a cent to any such proposed operators.
The words "duck" and "dead" come to mind, but not necessarily in that order!