This seems like it would have the same effect as increasing prices/tariffs, but in a much more convoluted way.

Absolutely, but this is more possible if we can start a giant rationing movement. Biden already had to talk about how he was going to keep prices low at the pump while we impose sanctions. This is what we can do as individuals to help with that effort.

Unfortunately there isn't a ton of capacity to transport natural gas across the Atlantic, it is possible and we are doing it, but we don't have enough infrastructure and specialized ships for this to replace more than a small fraction of what comes in from Russia through existing pipelines.

Nordstream 2 stalling is not a bad step, but that is future harm to Russia, we need to be hurting Russia today as well as preparing for a potential shutoff of all exports.