I have made a trial to put Logic on my old 8 core Mac and VSL on my 12 core I have been using Event input ! NO PROBLEM !
With 2 Mac you can use Network Midi (it's the same as IAC but on a network), I have no idea if it will be working with a MAC and PC
Also yo must not dream ! I have a 12 core Mac with 2 x Xeon AND A RAID OF SSD, you cannot expect to do the same with an 2010/2011 I5 or I7
If you see a bench that compare 2012 I7 to 2010 Xeon I will be very happy to read it
MacBook Pro 2019 16" 64gb 4TB + 2 x Odisseey G9 49"
MacPro 2010 12 core 2.93 ghz 64 GB Mac OS X 10.11 2722 Rocket Raid Sata III card with 8 x ssd
Kbd : P80 Yamaha, S88 + S25 Komplete Kontrol, DX7
I-Controls Pro
Synth : many....
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Logic X , Dorico, Band In A Box, ORB Composer
VSL : MIR PRO 3D, Appassionata Strings I, Solo strings , Wind, Brass, Percussion Complete, Dimension Brass, Big Band Orchestra series, Many Synchronised libs, Many Sychron Instruments
Kontakt, Omnisphere, QLSO, QLSC, CS 80, Arturia V5, Maximo, Realivox Blue. CS 80 V3, The Orchestra 3, Art Conductor, Genesis Children Choir, Lunaris, Lacrimosa, Kinetic libs, EW libs
Final Cut pro
Camera full HD