I've found that drinking a variety of substances gives a noticeably faster onset than just taking them dry, in capsules or bombs etc.
With kratom for example drinking it in cold water or milk gives an onset that takes about half the time that consuming it in yogurt would. The overall duration seems slightly shorter too though.
It's obviously essentially oral dosing, but just tweaked sightly.
I found oral dosing to be the best method for consuming some speed I'd got of one of the newer market places recently.
It was much smoother that way, and I also think it was more effective, and certainly more long lasting than railing or sublingual. And more functional too, like you say. And not really too fiendish at all.
I think I tried bombs, as well dissolving in a drink, and both methods seemed better than snorting or sublingual.
It's probably very similar for coke, although I haven't got all the bioavailability figures to hand, and cba right now tbh, but IIRC the oral bio availability for speed is pretty decent, and so I'm surprised more people don't take it that way.
Not sure what the case is for coke.
I know how to use Google lol, but am trying to tear myself away from the internet right now, and don't want to end up going down various rabbit holes of information right now.