If you can get that to work but it would be easier if BTCpay server and your lightning node were on a vps. It depends on how much it is worth to you. If you are a store where you will be receiving a descent amount of income and you must be able to take payments, a service like Voltage.cloud is reliable and really easy to setup. If that not so important I would go with the #[3] option with is mush cheaper

https://voltage.cloud/

That works too (that’s actually what I do for BTCPay), it just makes your vps more expensive.