I definitely won't agree with train drivers, bus drivers, or those who work in a slaughterhouse etc those without university degree and/or professional accreditation and no need to travel interstate and internationally for their job to get their jab first before those who need does. This is just not how our economy and society works.
This is how we have decided to manage it in Australia. People in essential services, delivering our food, driving buses, etc are entitled to be kept safe in their place of work, and to also be safe for the people they provide services to.
Managing covid has always been about health first, economy second. I can't see an argument for a consultant or person wanting to visit a trade fair being able to do so before persons providing essential services can be kept safe at work. International travel for essential services should receive vaccinations. But I'm not sure that is a very extensive list.