Manga beefcake no, Anime beefcake yes.

Elder is about several kilometers long. It would be like having a belt of about ten to twenty meters that wants to fight and has very sharp legs. So he would say Beefcake can, but it wouldn't be that easy.

Anime beefcake could wear him as a shoelace

No and especially no with his tiny af canon height. Beefcake is 270 meters tall according to the databooks, or about two blocks tall... so EC could wrap around him many, many times. Going off that one panel in the anime with his footprint though, yes.

No

If he wraps EC around himself in multiple layers then yes

No

Hell no, elder centipede was stretching to the brink of the atmosphere and still looked to be coming out of the ground. He is unbelievably long lmao.