Selector compatibility with player_head/mannequin profiles and custom names

Currently, there is no way (or I can't find one) to give a player their own head using @s in vanilla Minecraft. Presumably, allowing players to /give their own heads would look something like this: 

/give @p player_head[profile=@s]

Likewise, this feature could work for mannequins:

/summon mannequin ~ ~ ~ {profile:@s}

Of course, it would require a player and a limit of one.

A similar feature could be added to item names, item lore, mob names, and other locations where text can be used. For example:

/give @p diamond_sword[custom_name=[{selector:"@s",color:light_purple},{text:"'s Sword"}]]

would give a diamond sword with the name of the prompter, concatenated with "'s Sword". 

/summon zombie ~ ~ ~ {CustomName:{selector:"@s"}}

would summon a zombie at the prompter's location and give it the same name as the prompter.

Not only could {selector:"@s"} be used, but also scores, in the form of {score:{name:"@s",objective:"scoreName"}}. 

These features would provide a lot of opportunities for aspiring mapmakers by creating in-game features that do not require the use of a datapack or plugin.