If not, are there alternatives out there that share the same good aspect (safety, decentralization), without the power consumption of this technology?
No. Until today nobody has been capable of innovating after what Satoshi did 15 years ago and it is also too soon to expect any revolution in the cryptocurrency world.
As a daily use, BTC is at the moment unsustainable from what I know.
No it is not.
Completely understand that, but mining is heavily industrialized at the moment and POW could suffer attacks from it, correct?
I don't know what you have in mind when you use the term "industrialized" but a PoW coin can be attacked only if mining were centralized. Something that is not true about bitcoin.
There are videos online of people that mine just to warm up their houses in winter and breaking it even.
That would be like opening your fridge to cool down your house.
Can BTC switch to PoS in the future and remaining safe at the same time?
No, that is not possible. As I said above, there has been no revolutionary innovation after Bitcoin. The PoS algorithm was created a very long time ago and it quickly became obsolete because of the fundamental flaws in it. But because it helps shitcoins with premine to give the centralized authority a lot of profit, many shitcoins like ETH use it.