2nd option is intriguing but not sure how involved and what possible cost would be to buy whatever is needed and I’m not too sure it is achievable?
Brave chap 
I will try to draw a high end network diagram with key points over the next day or so, alas switches I am not familiar with cmds nowadays etc. but I am sure they can be researched online etc.
Also now thinking that maybe a multi NAT and DMZ type configuration using a couple of routers might work and be a little easier to configure, I will try to also produce a overview network diagram.
In a completely sane world, madness is the only freedom (J.G.Ballard).
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