For UM2 I use tinkergnomes firmware which has a preheat feature which I start as soon as I turn the printer on.
For UM3 I select preheat as soon as I load Cura.
I know this isn't the biggest help but it does reduce the time a bit.
Having the front door does help with stopping cold air slowing it down so it's only really the available accessory from UM or you could find a full enclosure kit.
Some people put towels on the heat bed which helps but only when preheating or it may crash.
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UbuntuBirdy 56
You can speed up this procedure with a hot air gun.
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