1. No. Phoenix and phoenixd (server) are using ONLY Acinq channels. You can't manage channels with other peers. Walled garden.
2. You can send to any onchain address directly from Phoenix. You don't have to do it through any swap, Phoenix have integrated swap. You don't need Boltz to swap out sats from Phoenix.

NOTES:

• Do not send out all the balance you have in Phoenix, always leave at least 5%, otherwise they will close your channel and you will have to pay again opening fees.
• Always start with a big deposit, so your channel will be well sized. Otherwise, each time you send more sats to Phoenix it will so splice-in and you will pay more fees.