IDK what the EU has in terms of selection of nutrient salts, but all brands are made from the same components. Irregardless, if you want, you can do this with any brand on the market except AN at least due to their secretive analysis. Just as long as you can track down the percentages of each bottle, you can input these data points into Hydro Buddy (HB), then with HB, you can target each element, and HB will output how much of each of your liquids is needed to achieve the levels you targeted. Being able to target different elements enables the grower to accentuate the feed based on known needs like elevated N for veg and early bloom, elevated P and K for mid bloom and diminished N and P for end bloom all while also having full control of things like Ca, Mg, S, Si, Fe.
I don't want to over sell you on this because I myself only have about 4 months experience with customizable nutrients, but I guarantee that with HB, you have full control of your levels which is never a bad thing. Nutrient lines kind of aim to feed all types of crops while being good for none. Other growers on RIU have enlightened me to the fact that perfect canna feed is very mild. All of my mixes range from 0.9 EC to 1.1 which translates to my meter as 730 ppm at 0.5 conversion factor at the most.
IMO, targeted feed regimens are intentional and precise whereas brands and feed charts are generic which usually ends up with everything being doled out too heavily which stunts plant growth WHILE ensuring you deplete those nutes quicker so you can get to the hydro shop to buy more more more. With HB, you can probably get 40% more growing out of everything.
I made a tutorial for using HB on 420mag. It's a bit tricky of an app, but it's free and does all of the math needed, so I'm not complaining.
https://www.420magazine.com/community/threads/making-your-own-nutrient-concentrates.455187/