Some people can still find the Home Depot kits that are Smart By Bond integrated (no Bond Bridge needed), but many of us cannot.
As you found, the Hubspace one is more readily in stock but is not the “correct” kit.
Chris Merck from the Bond staff mentioned another kit awhile back that has discrete commands that can be integrated with a Bond Bridge.
EDIT: All those universal kits assume an AC motor for the fan (not a DC motor) - likely true for your case since they don’t have remotes originally (assuming you have the physical pull chain speed change?)