Spawn Guardian Beams?

Nope.

 

You would be best to look into them, to see if theirs a way of spawning a passive invisible one, and giving it a target to traget, and hope it shootts the beam. Ill have look through the code and tell you if I find anything,

 

Yes, there is a way.
You spawn an invisible immortal squid at where you are looking, then spawn an invisible immortal Guardian above your head

 

Except that the gurdian could track you, not the squid.

 

You could cancel it's EntityTargetEvents, even though these are all 'dirty' workarounds