We're running low on eligible games that have been nominated and seconded. If more are not nominated and seconded in the future, I may start featuring games that have already been featured.
Duck Chess has been nominated and seconded. It has an Interactive Diagram, there are several engines that can act as computer opponents, it can be (and is) played on-line on chess.com... But as long as 'eligible' appears to mean that you should be "familiar with the variant", nominating and seconding doesn't seem to achieve much. So no, I wouldn't say the existing system is fine, and the fact that you consider featuring variants a second time should be a very convincing indication of that.
Duck Chess has been nominated and seconded. It has an Interactive Diagram, there are several engines that can act as computer opponents, it can be (and is) played on-line on chess.com... But as long as 'eligible' appears to mean that you should be "familiar with the variant", nominating and seconding doesn't seem to achieve much. So no, I wouldn't say the existing system is fine, and the fact that you consider featuring variants a second time should be a very convincing indication of that.