>I looked into what is available in form of ICs (like National
>LM9061 or Micrel MIC5021), and it seems to me they guarantee
>only gate-source voltages of 7V (LM9061) or even only 4V (MIC5021).

Have you looked at the Intersil HIP408x series? They have half and full 
bridge drivers. I don't know if they have any that will allow static drive, 
as the ones I am aware of use bootstrap capacitors to get the high side gate 
drive voltage from the PWM waveform. 

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