Or edit your skill_db:
445,9,6,16,0,0x1,0,5,1,yes,0,0,0,magic,0, SL_ALCHEMIST,Spirit of the Alchemist
447,9,6,16,0,0x1,0,5,1,yes,0,0,0,magic,0, SL_MONK,Spirit of the Monk
448,9,6,16,0,0x1,0,5,1,yes,0,0,0,magic,0, SL_STAR,Spirit of the Star Gladiator
449,9,6,16,0,0x1,0,5,1,yes,0,0,0,magic,0, SL_SAGE,Spirit of the Sage
450,9,6,16,0,0x1,0,5,1,yes,0,0,0,magic,0, SL_CRUSADER,Spirit of the Crusader
451,9,6,16,0,0x1,0,5,1,yes,0,0,0,magic,0, SL_SUPERNOVICE,Spirit of the Supernovice
452,9,6,16,0,0x1,0,5,1,yes,0,0,0,magic,0, SL_KNIGHT,Spirit of the Knight
453,9,6,16,0,0x1,0,5,1,yes,0,0,0,magic,0, SL_WIZARD,Spirit of the Wizard
454,9,6,16,0,0x1,0,5,1,yes,0,0,0,magic,0, SL_PRIEST,Spirit of the Priest
455,9,6,16,0,0x1,0,5,1,yes,0,0,0,magic,0, SL_BARDDANCER,Spirit of the Artist
456,9,6,16,0,0x1,0,5,1,yes,0,0,0,magic,0, SL_ROGUE,Spirit of the Rogue
457,9,6,16,0,0x1,0,5,1,yes,0,0,0,magic,0, SL_ASSASIN,Spirit of the Assasin
458,9,6,16,0,0x1,0,5,1,yes,0,0,0,magic,0, SL_BLACKSMITH,Spirit of the Blacksmith
460,9,6,16,0,0x1,0,5,1,yes,0,0,0,magic,0, SL_HUNTER,Spirit of the Hunter
461,9,6,16,0,0x1,0,5,1,yes,0,0,0,magic,0, SL_SOULLINKER,Spirit of the Soul Linker
Though have in mind this will also allow soul linkers to link themselves normally.