Welcome to the forum! And welcome to the wonderful world of picc-ing!!
Concerning models--I don't have much experience with plastic piccs. I've played the Yami and it's a good solid horn (of course). I've heard good things about WWBW's picc, not the best out there as it's not a pro horn but again a solid player. Can't say about any others, as I don't even remember what brand my old one was.
Concerning no lip-plate--I had qualms about a lipless picc at first. I'd played only metal-headed piccs for maybe 15, 20 years before I stumbled onto the Armstrong wood. I ended up having zero issues with it having no lip plate. The wood makes the body of the head joint fatter, so it doesn't really feel much different against my lip. And playing it is exactly the same as the silver. I freely swap between them, again with zero issues. Well, except the wood is more temperamental about wanting to be fully warmed up
while the silver will happily give its best with just a couple minutes' worth of blowing through it
Only real diff is the Gemi is such a well-made little horn that it plays like springy butter, while the wood is more typical of every other picc I've ever played, including the Gemi model a step up from mine.
Do enjoy your picc-testing. And if they have more than one of a model you sort of like, then try them all. As my silver proves, each horn is very much an individual.