I am not very familiar with father Hesse(I just now discovered him) however I came across this quote, supposedly from him, on another forum. I don't know if he changed his opinion on this or not, but he states that it's ok to attend FSSP or ICKSP if that's all that's close...
"The reason I mention them (FSSP and ICKSP) is to explain to you why I want you, if it is possible, to attend the Masses of Saint Pius X... If you happen to live near a chapel of the Priestly Fraternity of Saint Peter, and a chapel of the SSPX is two hours away, of course you are allowed to go, provided it is not the indult Mass and they do not provide communion in the hand there. Or if you live around the corner of the indult Mass, and they do not commit sacrilege there, you are allowed to go there, but I warn you there are two dangers: First of all, in their sermons, you cannot be sure you will get the Doctrine of the Church. With the SSPX, even if the sermon there is boring, it will never be against the Doctrine of the Church. With the indult Mass, and even the FSSP, there is a probability that they will tell you the truth, but you don't know."