Personally, I think Wallet of Satoshi is a solid choice since it supports both Lightning and on-chain payments, making it versatile :/
Yeah, in that case of on-chain payments, would it be necessary to make customers wait 6 conf? I believe I am over complicating myself. Lightning or cash might be the answer.
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Indeed, just go for LN.
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One or two should be fine. It's very unlikely to see reorgs after that. I'd be more concerned about ending up with a bunch of low-value UTXOs (depends on how big you're thinking these on-chain transactions would be).
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