I'd recommend getting a charger from a well known brand. Anker is regarded as one of the best when it comes to aftermarket chargers. They sell a few 60W chargers (stock is 65W, but the Anker 60W charger I use is practically the same charging time). I'm not sure if these are sold by Amazon MX, might need to purchase from eBay, etc:
https://www.amazon.com/Anker-Delivery-Charger-PowerPort-Matebook/dp/B07BQJWDRM/
Yeah but Anker makes a multiport USB-C charger.