2

What do you mean, 'like they normally do'? Japan opened with Russia in 2019, not either Ireland or Scotland. England opened with Fiji in 2015, not either Australia or Wales. New Zealand opened with Tonga in 2011, not France. Australia started with Argentina in 2003, not Ireland. Only France has kicked off with the best match in 2007 and 2023, with Argentina and New Zealand respectively.
I think Aus would see a Japan or similar as very much their speed for the opening match, although putting the opening game in Perth probably argues timezones and a European team.