"Bedacht" is the past participle of the irregular verb "bedenken" (K. O'Brien)

Yes, but it is also the past participle of the regular verb 'bedachen' (to cover with a roof) and an adjective ('circumspect'), so there is a lot room for further interpretations.

However, I agree that it is here probably the past participle of 'bedenken', but not with the in dictionaries first listed meaning of "think of" or "take into consideration" but in an old obsolete meaning which is translated in my dictionary as "shower somebody with gifts" or "give something to somebody".

Wolfgang