Yes, I have done this but avoid it bc of the extra fee.
The extra fee doesn't bother me though, just the security of using it for zapping
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I gotcha. Might not be best especially if you funded Phoenix with on chain. Not sure if zapping breaks the heuristics.
Set up an Alby wallet and fund it with your Phoenix.
Alby = pocket change
phoenix = checking
Onchain = savings
I use WoS for zapping on mobile, Alby on web