Well it didnt work...

So im back to a dummy button on my main and
#showtooltip
/cast [target=focustarget] healingspell --On my slaves i have my main as focus ofc.

Bummer
Simply there isnt any command to target your targets focus (However if there is please do post)
and yes the delay before your targets target is shown is bigger than the delay of Keyclones cycle.
3points to the second poster in this thread :P