I had a thought to trying forming an arcane tunnel between two thing which are arcane connections to each other, thereby allowing communication and spell casting between the two points at an equivalent of Range: Touch.
Why? Well those ACs might be enchanted devices which use spells to communicate.
So the “near” endpoint is not connected to the caster, but between two items that are already valid arcane connections to each other. Or the caster can target the endpoint near them as normal, and not be directly target-able from the other end. Or allow another Magus near one endpoint to target the other location. Or as a mechanism for two parts of an enchanted device to send signals to another without using the R: AC for the subsequent spells.
Opening the Intangible Bridge
Rego Vim Gen, R: Arcane Connection, D: Concentration, T: Individual
This spell opens a magical tunnel between two arcane connections, one of which is in the possession of the caster. Spells cast through this tunnel must be at least one magnitude less than the level of this spell.
(Base Gen, +4 Arc, +1 Conc, +1 additional Arcane target)
And a version to affect all the endpoints if multiple ACs are to be used, using target: Group.
Opening the Intangible Network
Rego Vim / Imaginem Gen, R: Arcane Connection, D: Concentration, T: Group
This spell opens a magical tunnel between either the caster and a set of up to ten arcane connections, or an arcane connection the caster posses and a set of endpoints. Spells cast through this tunnel must be at least two magnitudes less than the level of this spell, and may optionally use the target: Group to affect all endpoints at once.
(Base Gen, +4 Arc, +1 Conc, +2 Group)
These and other new Ars Magica spells are found in the Grimoire.