I eat a lot of abiu here and I suspect that the vast majority of those at market are from seed grown plants. I half the fruits and eat with a spoon and have never really had a problem with objectionable latex -- sure you can feel it on your lips if you smack your lips but by no means bad. I assume you tried one that was all yellow or nearly so? If it is from a decent cultivar, they are quite enjoyable just ripe (when that are custard-like) or fully ripe (and more jelly-like). If it is a good one, you can even scrape the skin pretty aggressively to get every last bit of flesh and still not have the latex too objectionable.
John