Do you really need them on separate switches?
Why not install one SFCU near the floor as in your original plan, then install a flex outlet plate behind the TV with the TV and soundbar connected directly into it? Yes it looses the flexibility of unplugging and taking away the equipment but space for the connecters would no longer be a problem. If not then connect an IEC splitter to the flex outlet and continue with your cutting off plug and replacing with IEC male idea (if there is room to conceal them).
Why not install one SFCU near the floor as in your original plan, then install a flex outlet plate behind the TV with the TV and soundbar connected directly into it? Yes it looses the flexibility of unplugging and taking away the equipment but space for the connecters would no longer be a problem. If not then connect an IEC splitter to the flex outlet and continue with your cutting off plug and replacing with IEC male idea (if there is room to conceal them).