Motorcycle shops will likely happily sell you gear, but be wary of Harley lol - they are like the Snap-On of motorcycles in terms of cost.

Micromobility includes motorcycles though they aren’t as popular as ebikes lately. If I recall correctly, @dudeimmacguyver@kbin.earth is a moto nerd, so they have have some good suggestions.

Brands may also vary by market so if you mention if you’re in UK, US, EU, CN or whatever, that might help in terms of vendor and brand suggestions.

Not familiar with the tires on that bike, but it might not be a bad idea to have some inserts in those tires to help prevent a catastrophic blowout at speed. I use Tannus Armour in my efatbike, it reduces the range but protects from flats and provides limited run-flat capability.

Maintain your bike meticulously, because an accident at that speed can be life altering or even fatal. Be safe!