Having track ends on your conversion wouldn't change anything about the way the bike rides. At all. Why would you recommend this? It makes no sense. Are you really paranoid about your wheel coming out? Tighten your bolts. It's that simple.

I mean, seriously, that's what you think the difference between a road frame and a track frame is?

And that DIY track ends link... the guy didn't even weld it himself. WTF? If you have horizontal dropouts already, there's no reason for that. Unless you don't know how to tighten down a bolt.