havent you ever applied minoxidil through a dropper? apply zix to your scalp the same way. if properly applied the hair shouldnt absorb 'most' of it like you said. just use the dropper to apply it to thinning areas and let it stay that way.
i hope you're not using zix by itself to combat hairloss and is will most probably be ineffective.
if combined with other topicals and maybe finasteride it'll give you better results.