The type E tws seem to have a 13.3mm, it's still a bit small for me unfortunately.
Regarding the Sednaearfit you're right they are longer than the Crystals! That's what makes the Crystals a bit annoying to fit in sometimes (you just need to make sure they are fully inserted). But it seems the Sednaearfit also use a more conventional type of silicone, right? I think they might work really well with the Timeless.
I just realized that I have been referencing the wrong type of tip in my comparison. I was talking about the Azla Sednaearfit Xelestic, not just the regular Sednaearfit... Apologies, though they are the same thing as the Crystals (same material) just longer and more for regular IEMs. I don't have any experience with the regular Sednaearfit tips.