My concern with trying to do the address selection without RST line is
that it is quite unreliable, as it really depends on timings between the
chip reset, INT line being driven by the host and then being switched to
input.

I think you are right. thinking twice I should be able to fake the reset line
by controlling a regulator to the voltage source for the pull-up. It seems a 
more solid solution.

Thanks a lot for your help and sorry for the noise.

Alex