Omoplata, literally "shoulderblade", is just an udegarami applied with the legs. I learned it on a Judo mat, ages before I ever heard of BJJ. I've always understood it to be legal under IJF rules.
Gogá refers to the front of the throat. Gogaplata (from gogá + omoplata) is a BJJ coinage, referring to a choke in which the legs are employed in a way analogous to their use in the omoplata armlock.
Kawaishi used to teach several such strangles. I believe all of them are IJF legal as long as: (a) the spine is not endangered; (b) the head is not directly scissored; (c) the foot isn't applied directly to the face.
Am I missing something? Why would these techniques be illegal?
Yours in Judo,
Brian P. Griffin