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Also, Multi-part payments can help, which allows automatic splitting of a single payment into multiple smaller ones and use multiple channels for a single payout from the site. But currently they need more adoption, they are supported by the latest release of c-lightning, but not other implementations yet AFAIK.
Why do you need exactly the same inputs? Because of potential double spend risks? There is coin control button in Send tab or bitcoin-qt, where you can select individual UTXO's.
