The Momentary Tile is designed to work with devices which implement the Momentary capability. The Virtual Switch in Hubitat is just Switch even if it can be configured to act a bit like a momentary device in that it can automatically shut off.
There’s a “Virtual Momentary” device type in Hubitat which implements the Momentary (and Switch) capabilities and could be used with the Momentary Tile layout.
I put together a Virtual Momentary Switch driver that is a Switch, Momentary, and Button. That probably provides the best flexibility between Rule Machine and SharpTools for a ‘button’ type of functionality.