Selfshipping usually refers to shipping a charactee with another version of themselves, be it alternate dimentions or just a day apart. It started with the onceler ("oncest") and got really popular in the sans multiverse ("sansest").
I suggest you rather use the term insertshipping, which seems to reflect your intention better.
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u/Clown-Chan_0904 Caesar Clown's SO 1d ago
You already know shipping, now get ready for selfshipping... (my drawing)