I was lucky(?) enough to buy a Laser Tools oil filler funnel that grips/seals the older oil filler point - the ones that the cap has 2 "stick out" locking in parts, I bought that cheaply and used it since maybe 2001 until now on VW Polo 1.4 16V, same for
SEAT Ibiza, Audi S4 and VW Polo 1.2TSI, filling up the 2019 SEAT Leon Cupra was not so easy, so I think that I reverted to using a clean but very old smallish plastic funnel.
If/when I convert to running a car with an EA888 engine, I'll be buying one of the ones being sold on ebay where you buy the basic bottle/funnel, and then also buy the correct adaptor for it to suit your present engine - that type will attach-seal onto the engine okay it seems.
Engine Oil Funnel Filler Adapter Tool is ideal for filling oil for many types of vehicles. The funnel is made of high quality plastic materials, which ensure it is tough, corrosion resistant, rustproof, lightweight and durable and has a long life.
www.ebay.co.uk
Something like the above, though check that the adaptor is the correct one!
Edit:- I don't mind spending my money on garage stuff(obviously)!