Thanks, shame not come in tot he RT-AX86U/S.
It is, I believe ASUS at keeping all the cool stuff like LAN side VLANs to there higher end GT and Pro models etc.
So out of the above options, which one are you considering, I assume 2nd option based on your questions ?
If so, I can draw a high end network diagram with key points but a tad concerned this maybe a tad difficult and hence raspberry pi maybe a simpler option 
In a completely sane world, madness is the only freedom (J.G.Ballard).
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