i found freqshift~ in extended but it does some strange aliasing and did even produced extreme amplitudes... which i currently cant reproduce
so i did a first experiment myself
it is samplerate dependant and has other little bugs but i think its somehow better than freqshift~

any suggestions ideas or whatever?

http://www.pdpatchrepo.info/hurleur/fft-freqshift.pd

Have you looked at H09.ssb.modulation? It does it without FFT and isn't sample rate dependent.

thanks seems great
only downfall i could find is that it reflects at 0hz
well and that i refuse to understand what's happening