The -en thing can still be sern in some petrified accusatives in modern Dutch. For example, 'achter' means behind, and 'naar achteren' means towards the back. This is just a remnant from when the Germanic languages still used more cases.
Also like Dolo says, the infinitive form is and was often the same as an imperative form.
So gramatically I don't see a problem. Valden also seems like a form that could once have existed in Germanic dialects. Modern Dutch fold is 'vouwen', and 'al' often changed into 'ou'.
I wouldn't focus too much on one Germanic 'language' by the way. So many spelling variations and dialects existed!
Also like Dolo says, the infinitive form is and was often the same as an imperative form.
So gramatically I don't see a problem. Valden also seems like a form that could once have existed in Germanic dialects. Modern Dutch fold is 'vouwen', and 'al' often changed into 'ou'.
I wouldn't focus too much on one Germanic 'language' by the way. So many spelling variations and dialects existed!


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