You sound like you know what you are talking about, so I would say just use align=right. Of course just be aware of the disadvantages of this:
- more dificult to maintain later. If you have multiple tables and change the alignment you will need to do this for every table
- search engins may penalise sites that rely heavily on deprecated tags
- browsers could remove support for deprecated tags in future. They will anounce this in advance though, so of you expect the site to revive ongoing maintainable you will have time to remedy this