Hi. Not all Danish M1's were made by Beretta. Lots of 'em came directly from the States.
Haven't a clue where you'd find the parts you want. They'd cost a fortune too. A stripped bolt, for example, is worth $99Cdn from Marstar. Gunparts wants $69US for a stripped SA marked bolt.
Trigger groups are sold by the individual part. Marstar wants $89cdn for the housing alone. $29 for a hammer.
If the headspace is OK, I wouldn't worry about who made the parts. Does it have a VAR barrel?