well fundamentally LN and ecash mints are very different, so yes you could use LNURLw but your node needs to be online, have liquidity, and have a synced node.

With ecash you can do payments offline, without the channel liquidity dilemma, no onchain utxo. You risk doublespend of the ecash whilst online, there is a certain about of trust you have to have in the sender when you accept an offline payment.

I would recommend looking into the documentation on cashu.space and watching calles talks and podcasts about it