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I've found the best method is live adjacent to a municipal golf course,
and its surrounding aged hedgerows and woodland.
When one flies into you, yes really, they can & do fly,
take her home,
and introduce her to the luxury habitat you have prepared,
sizeable logs dug into the bottom of raised beds with a 'tower' of hardwood mulch leading down from the surface. If Firefox and the 'net play well I will upload a picture of the fine specimen that emerged earlier this Summer.
(F it, tried 3 times nothing uploaded).
If you could induce a fecund stag beetle to lay her grubs into it, they would gradualky eat through it.