dnd 5e – Is there any way to convert the spell from the Shadow Blade into a sorcerer's pact weapon?

Do not forget that immersing yourself in a 3rd level sorcerer can give you the metamagic of the extended spell, which means that you can extend the duration of the shadow sheet to 24 hours, more than enough time to perform the link ritual, so with enough patience and a sorcerer's sorcerer's combo, it's possible, whether you use spell slots or not when you cast it, it's more likely that you will not lean toward it, as it would take it out of your pattern's magic instead of the yours, but I recommend asking your DM. (I would consider it a form of mastery of the spell, such as signature spells and mystical arcanums)