If it’s setup as a Temperature Sensor device, it will default to using the Temperature Sensor Tile layout but you can choose a different tile layout.
For example, you could switch to the Hero Attribute Tile layout which lets you display whatever attribute you want with more control over the units:
And if you need even more control over the layout, for example to mix and match data from multiple attributes or even multiple devices, you can use a Super Tile:
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Why are you forced to create a Virtual Temperature Sensor device in the first place? If the Ambient Weather device has attributes with your desired values, you can use those directly in a Hero Attribute Tile layout or a Super Tile in SharpTools.
If you’re coming from ActionTiles, this may be a bit different than you’re used to as ActionTiles is limited to specific capabilities and tile layouts. SharpTools is different in that it supports multiple capabilities and layouts including custom capabilities and layouts. 
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As for the humidity approach, as long as the device has one of the other core capabilities supported for authorization, you can select the device under that capability section.
Otherwise you can authorize it manually as long as it has a generic Sensor, Actuator, or Refresh capability.