I first heard about Hoya sp. GPS 7240 a few years before Joni at SRQ Hoyas went out of business. I tried to obtain it from her, but she was out every time I tried to order it. I forgot about it for a couple of years and then saw it listed on AH Hoyas website and ordered it to fill out a 12 plant order. I received the small plant from AH in 2016, and it grew with many stops and starts. I was intrigued by this species because the flowers looked much the same as Hoya sigillatis, but promised to be easier to cultivate
While I did find it slightly easier than growing Hoya sigillatis, it was still no walk in the park. I managed to flower this plant for the first time at about 2 years of age. After flowering it a few times I offered it for cuttings during one of my spring cutting sales. Unfortunately I sold to much of it, and the cutting that I had left did not survive. This is something that I am much more cognizant of now as it has happened to me a few times. Always make sure that you have enough of the plant left to guard against loss.
I wish that I had more information about this plant for you, but after scouring the internet, I can come up with nothing as to where this plant comes from. I am wondering why it has not become a species yet. It is funny some Hoyas become a new species literally months after being discovered and some take years. This one has been in the trade now for at least 10 years, but still has not been named other than by accession number.