Keep it simple and use one line and faucet for each type of beer, peronally i wouldn't want a pint of lager poured out of a faucet that just dispensed another type of beer.
As far as switching to blended gas i don't feel you'll gain much by using a 60 Co2/40 N mix for pushing regular products that work well with just Co2. Get your system balanced and your temperature and pressure dialed in you'll do fine without using mixed gas.
If you want the flexibility of adding a nitro beer then pick up a cylinder of the 75 N/25 Co2 mix. In this case you couldn't run your beers through the same faucet anyways, you need a stout faucet with a diffuser plate to properly pour a nitro beer.
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