500ml is, uh, a lot! I probably have 120mm in my 4.8s? I use oko though so it doesn’t dry out like stans does. IIRC they supplied the mulefut ready to tubeless and with 6 of the little bottles of stans sealant per pair 🙂
I have no experience of that exact wheel, but, I just use electric tape/pvc tape. I used to get a really wide roll and cut it down, but that’s kind of a faff, 80mm tape is available I think.
But last time I found some pvc tape that was wide enough to cover the cutouts (60mm possibly?) and laid that sticky side “up” to be the visible rim tape, which left a band of rim uncovered. Then I taped over that, which is a pain because you end up with 2 sides of sticky stuck together which is quite hard to manage and stretch on and such, but did mean it was taped to the rim rather than just being held on by the tyre. Easier to do than to describe!