Hello. Sorry, how much time did it take to get assessment by ASMIRT? In the website they say up to 16 weeks.
By the way, I think you can be assessed as radiographer and immigrate as a radiographer as well, once you settle down in Australia, you can be assessed as a sonographer by AHPRA. Not all jobs(radio, sono...) require ASMIRT assessment, but nearly all of them require AHPRA assessment.
These days for getting a 189 you need to have 90,95 points, but with 70 to 85 you can get 190 visa.