Nesting tickets like this is common, or at least it is common for people who do these kind of trips regularly. It is perfectly allowed but it comes with inconveniences and risks, part of the reason why it is cheaper. It is also quite often the only way to construct the itinerary that one desires between non-cooperative carriers.
If you are carry-on baggage only, you can likely complete most check ins online and use an app instead of a printed boarding pass. In this case there is no reason to exit the secure departure lounge in the airport. Airside customer service desks can also check you in and print boarding passes, avoiding unnecessary security. (For the super low cost carriers, this does not apply.)
If you are taking bags, expect to have to collect and re-check in. It is narrowly possible a check in agent might be willing to through-check onto a separate ticket on a separate carrier, but travelling on cheap tickets in Europe, it is simply not worth their time.
If you miss a flight, you will probably be treated as a no show and the remainder of your ticket will have zero value. That includes the return portion of the affected ticket. Most airlines will not help you except through selling you a new ticket, although it never hurts to ask.
You will need to consider managing that risk carefully. Walk up prices can be higher than transatlantic flights, particularly if you are on a tight schedule. I advise you to research alternative options in advance so you have a plan B costed and ready to execute (maybe it is “hire a car”, “take the train” or even just “forget the side trip to Zürich”). If you are doing this just hoping it will all be fine and you will definitely be on time to your own wedding in Zürich later the same day, then you are doing this wrong. If you have weighed the options, added some padding between your flights and you don’t mind being late, then you will probably be okay.
In general I prefer to get all “connected” flights into one ticket, even at an inflated cost, but then sometimes back-to-back ticketing is an acceptable solution.
Your plan is possible but risky. I would allow at least 4 hours in Warsaw, because if you misconnect, you are correct, you are on the hook for everything.
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