Ori's my personal favourite character, and probably the champ I have most experience in. In my usual group, I typically play mid, so I've managed to get a TONNE of games in with her.
The telegraphing issue isn't really a problem once you get used to her skillset. In fact, it's one of my favourite things about her. You have an incredibly high utility AOE kit that scales well. As such, people expect you to do certain things at certain times, and so will stay out of the kill radius of your ball. That means that against any half-competent opponent who knows what they're up against, they're effectively zoning themselves permanently, except with none of the escapability of being able to hide behind minions or tanks.
Start boots/2 health pots and 1 mana, then build 2 dorans rings and chalice. That's your mana regen sorted until lategame, and gives you some nice magic resist to boot. Lategame, buy Rylai's then Deathcap, and start selling your Dorans as needed to free up space. By the time you're level 12-13, you no longer need their mana regen. Keep the chalice though.
As for Swain, he's really not as situational as people would have you believe. He's another of those champions who people will keep their distance from simply as he's so survivable and can deal a nice amount of sustained damage. At the very least, you can force them to dodge nevermove instead of farming early game, and once you have your ult you frankly cannot get ganked by any fewer than three CC-heavy people. The build I just explained for Ori works wonders here, too. That mana regen will keep you ulted for even longer. People constantly forget that with an 8 second cooldown on your ultimate, there's no reason to NOT spam it for wave clearing.
That kind of Poppy can work, but really if you're going to do that you'd probably be better off going someone like Nautilus, who is MUCH more survivable, has more damage and just generally brings more utility to a lane for a carry to farm/bruiser to kill-lane. Plus, once you have your ult you're going to ruin the day of just about everyone in a teamfight or contested tower push.