Seems obvious in hindsight, but my switching problem was easily remedied by using a TRS jack and using the ring to switch the input instead of the tip... Another revision...
https://oshpark.com/shared_projects/LYY97Xoa
Tip and ring switches are left floating, pad next to each is to create a solder bridge to connect whichever one you want.
LND150 pre on input jack
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