I remember a post where someone has done that. Look up the successful / unsuccessful SN post and check the 'unsuccessful attempts'.
Although I guess if you want to abort that suggests you actually want to live in a way. Alternatively you could double down and chug down another glass, and if you vomit again, another one etc...
I went through the the successful/unsuccessful Sn post and found the testimonials of six of the unsuccessful. It appears all but one vomited. 4 of the 5 that vomited had taken an antiemetic. Surprisingly the only person who did not vomit didn't take an antiemetic. All were rescued and ended up in the hospital. Some Of the unsuccessful said they probably would have died if the had not been rescued. None of them suffered any permanent damage. Here are the links to the posts:
https://sanctioned-suicide.net/threads/sn-failed-attempt.4919/
https://sanctioned-suicide.net/threads/took-sn-heres-my-story.15395/
https://sanctioned-suicide.net/threads/my-experience-with-sn.13654
https://sanctioned-suicide.net/threads/sodium-nitrite-attempt.2902/
https://sanctioned-suicide.net/threads/sad-to-say-the-sn-didnt-work.23457/
https://sanctioned-suicide.net/threads/sn-megathread.1156/page-163
I also came across a successful attempt of an individual who took an Aniiemetic and still vomited and died.
https://sanctioned-suicide.net/threads/how-do-you-feel-after-ingesting-sn.28010/page-2#post-506736
It would be interesting to see how many of the successful attempts vomited. It appears vomiting is a given, even with an antiemetic.