I have now started the fading test of the Canon OEM bottled inks in comparison with other inks. See this.
As the Canon G-series printers use print heads that are modified combined print head/sponge cartridges, I think the bottled Canon inks are very good refill inks for the Canon 2 cartridge printers. I will also test that.
Don't do it. Ink for Epson printers, genuine or not, is not suitable for use in a Canon printer. Epson and Canon use different printhead technologies, and different ink properties are needed for the two printer brands.
Could you please link to the products you bought and to the instruction videos? I think the cartridges could be refilled the same way as they were remanufactured, but I need some info to give a suggestion.