There is no risk to the Teflon itself, or from it; PTFE breaks down at about 500 F, which rice cookers will not achieve, especially on warming setting. Other than that, PTFE is one of the most inert substances known to man, as the atoms are already bound in energetically very favorable bonds: little is as able to displace them without significant input energy (thus the high breakdown temperature).
On the other hand, you should not hold rice for a long time without either refrigerating it, or having it above 140 F (60 C) as there is some risk of Bacillus cereus growing and causing food borne illness.
There are some advantages to a pressure cooker, but I don't think that the rice QUITE finishes in 10 minutes in my experience. For proper texture, it still seems to take some time for the rice to fully hydrate and steam itself after the heat is off. A normal well-covered pot of (most kinds of) rice takes approximately 25-30 min after it comes to a boil, and 10-15 minutes of that is resting with no heat. The pressure cooker might save 8-10 minutes off of that, because I think you'll not need as much time on heat.
The downsides of a pressure cooker include: 1) It's much too easy to cook off too much water and burn or dry out the rice while on full heat, because you cannot see how much water is inside. 2) It doesn't hot hold the rice very well. (In Japan, Korea and China, it's generally considered rude to serve cooled off rice). and 3) It's also not so easy to cook a small amount of rice, because the minimum amount of liquid (by manufacturer recommendations, based on capacity of the vessel) may be higher than you'd need for a typical 180ml scoop of rice. Items 1 and 3 can be mitigated with practice, I suppose. I had pretty good results with a stovetop pot that wasn't a pressure cooker back when I did it regularly, and I think it's not that hard to adapt to the difference with a pressure cooker, but I've certainly made my share of timing and water volume mistakes.
The induction rice cooker I have does have a "quick" mode, which finishes in about 23-25 minutes (similar to stovetop). The cycle doesn't seem to perfectly steam the rice compared to the regular or eco mode cycles, however; texture is a bit firmer than it ideally should be. The 43 minute standard cycle produces very good results, never burns, and keeps hot without major texture compromise for up to about 8 hours (after that texture degrades, but mine will keep even longer if I leave it on). Some models even have an "okoge' feature to simulate the traditional cast-iron pot technique that was common in Japan through the early 20th century, which results in an intentional slightly crusty bottom. IH and Fuzzy Logic rice cookers make constant subtle adjustments that you may not need to make if you're very consistent in timing and volume with a stovetop or pressure cooker.
Mostly the value of a rice cooker is that you set it and forget it. Once you start it you can focus on the prep work for other things. I use it even when I'm using the pressure cooker for lentils or whatever. The hot holding, which is still essentially an extension of "set it and forget it," is another key advantage.
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I have one of the Cuckoo cookers with a Turbo mode. The one (slight) downside is that white rice will come out a bit more... gooey? with the Turbo cooking. It's not bad and seems to primarily affect smaller batches. If you let the rice rest a bit and plan on tossing it with oil or butter (or just don't mind stickier rice), it's definitely workable.