That's an interesting idea, but the problem is that they'll just go to eggy every time, and wrappers don't like switching in on eggy.
It's better to just stick to starzam. Speedsters are there to outspeed enemy wrappers and threaten paralysis. Dugtrio doesn't really do that(paraslams aren't good enough) and he is scared of the common wrappers.
Trio is still inferior to goldon anyway because it's better to bslam eggy than to slash it, and goldon is better at bslamming. Goldon is also good for PP stalling aginite, as they can absorb every second wrap and only take 16%, then try to catch the hyper beam.