Hello Everyone,
Inspired by JohnsonStuff, I was wondering how he made that : In game only a pants with boots fused in ! I said : what a great idea indeed !
Time to  awake Hephaïstos from his forge ! so using my tiny skills from Blender  : here we are ! I made this mod for my V all by myself, masksset, reconstructed mesh, textures... and I'm proud to share it with you guys.
For those interested in how I made that, I'm making a brief walkthrough in KS discord if that possible.
My atelier store is updated for this mod.

INSTALLATION:
Extract the .zip and copy the 2 folders \archive + \r6 into [...]Cyberpunk 2077 folder (see below different paths to the game)
Steam:
\SteamLibrary\steamapps\common\Cyberpunk 2077\
GOG:
\GOGLibrary\Games\Cyberpunk 2077\
Epic:
\EpicLibrary\Cyberpunk 2077\

code :
Game.AddToInventory("Items.songbird_boots",1);
Game.AddToInventory("Items.songbird_boots_gold",1);
Game.AddToInventory("Items.songbird_boots_green",1);
Game.AddToInventory("Items.songbird_boots_mox",1);
Game.AddToInventory("Items.songbird_boots_red",1);
Game.AddToInventory("Items.songbird_boots_white",1);


UNINSTALL:
Delete in :
...Cyberpunk 2077\r6\tweaks\phoebe_evelyn_jacket : "phoebe_songbird_boots.yaml"
...Cyberpunk 2077\archive\pc\mod : "phoebe_songbird_boots.archive.xl" + "Phoebe_Boots_for_Songbird.archive"

CREDITS
Great Thanks to :
WolvenKit Team
Cyberpunk 2077 Modding Discord
Bedellia for introduction to modding and all precious advices.
JohnsonStuff for the luminous idea !