I used 32650's for my e-moto,
https://www.endless-sphere.com/forums/viewtopic.php?t=117496, so I can comment. I'm sure they're not exactly the same spec as what you're looking at, but they'll be close enough for a comparision.
I used 24s12p, and I built the battery myself. Total weight was about 110 pounds. Total bike weight was about 350 pounds. My speed and acceleration specs are similar to what you are planning for. At 12p, they're rated for continuous discharge of about 215amps, and short bursts of supposedly 700 amps. Luckily, I built it as a commuter, not a speed demon, so this is just fine with me. I can comment that while these cells technically can handle the high discharge rates, you will likely notice a bit more sag than what you will actually plan on. Again, I don't mind it, since I'm just commuting; and during normal periods of acceleration, I see average sag hover at right around 5%, acceptable in my opinion. But if I have to floor it for some reason, it sags to 10%. It rebounds back up quickly enough, and I have yet to have a situation where it sags so much that the BMS cuts off due to low voltage.
I would say with your planned 8p, you will see even more sag than that. And 23s? 24s would be better for a bit more speed. The bike is probably going to be heavier than you think.
Earlier in the post someone suggested A123 LiFePO4 pouch cells. On my next build this is what I will use as well, they are supposed to handle higher discharge rates better with less voltage sag.
https://batteryhookup.com/products/4-pack-a123-3-2v-31ah-lifepo4-cells?_pos=1&_sid=af0cd4445&_ss=r
If you used the above cells and were up to assembling it yourself (i know you said you didn't want to, but these shouldn't require spot welding or soldering), you could do 2p24s to get 72v nominal, 86V peak, 62ah, for about 4.7kwh. Weight for just the cells would be 30 kilos, call it 45 kilos with the cabling, connections, case, ect.
Can't wait to see your finished conversion. It looks so great so far, really nice starting point.