I actually made lemon meringue pie using Pierre Hermé's lemon cream twice very recently. The cream is very good and rich, though it's true that it's different from the traditional cornstarch-thickened lemon filling, so you could give it a try and see if you prefer it.
On the meringue, I've never been able to pull it off successfully, and while I hate making excuses, I think it may be since I'm using a hand mixer since I don't have a stand mixer.
The first time, I used an Italian meringue heated to 255°F, but it never got to stiff enough peaks after adding the syrup. I had to actually place the bowl in a hot water bath to get it to firm up a bit, but didn't get to quite the stage I wanted and was a bit runny when cutting. However, I did use the tricks mentioned above (adding cream of tartar and the cornstarch paste), and there wasn't any weeping from the meringue, even several days later.
The second time was actually today; I tried a Swiss meringue using Stella's recipe, but again the meringue couldn't even reach soft peaks after 20 minutes of beating, so I placed it in the hot water bath. Unfortunately this time, I guess I heated it too much, since it initially gained lots of volume and was on the way to stiff peaks, but then lost all the volume and became super dense, essentially just becoming a marshmallow cream. It actually ended up breaking one of the tines on my whisk attachment, so quite an unfortunate failure this time. I guess I'll just hold off on making Swiss/Italian meringues until I get a stand mixer haha.