I just so happened to he checking FF for the first time in a few months, just to ask something similar! Im super into using a funnel, but my partner isn't really into feedism so I need to do things myself.
I spent a long time trying to get a standard funnel and tube to work, but unless you can put screws into your wall you're probably out of luck there. I've found great success with a standing funnel though! Granted, it's made for a group of people at a party to down beer, but you can optionally use just one funnel/tube at a time.
Can be a tad annoying to clean if you let it sit though, so try to rinse it out asap afterwards if you can. The one I use is called Head Rush Bongzilla (apparently they've doubled the price since I bought it?? WTF).
I've used it to down gainer shakes even when not in the mood for a funnel, just using it as a tool to help me finish a thick or gross shake. Honestly very helpful! Just bear in mind it will *always* make a small mess, plus rinsing and drying it out after. Honestly I don't use mine too often for that reason, even if I do love it.
The nozzles suck to clean, but they're perfect for using the funnel solo. You hold a button down to release the liquid, so you can pour it in the top and walk away/sit down/whatever without worrying about it spilling everywhere.
9 months