Happy Holidays!
...I've been happy using the ultra lightweight cassettes from AliExpress...
Which ones did you try? From ZTTO?
The Seaboard frame comes with a carbon fiber fork: https://tsunamibicycle.com/product/gr02-gravel-frameset-alu-alloy-disc-brake-thru-axle-black/
Some of the build pics and videos online show a smooth fork without attachment points. Most Ali listings however show forks with mounting points. I wonder if the one with mounting points the new stock fork or do you have to specify which one you want?