Some people carry a small loaner, and it works for them.
I no longer offer my knife at all. In the past I was willing, but lately I just enjoy watching the show, maybe asking if they need a knife, and fetching the store/factory issued ripper after a search - usually misplaced, which is long enough that they get it open.
If they are really struggling, I offer to help, and if they hand it over, I'll used mine palmed and choked on the second choil, finger down to the point, turned away from them. I go slow, and put it up before handing things back.
I don't neeed to flash it around and impress anyone, just act like a responsible old fart getting a job done with the proper tool.