sorry if I'm being picky, but technically speaking, wouldn't
Jeg vil ikke gjerne = I do not want
and
Jeg vill ikke ha = I will not have
the infinitive is the verb in it's basic form.
Infinitive
a reise (to travel)
a ha (to have)
a komme (to come)
Present tense
Jeg reiser (I travel)
Jeg har (I have)
Jeg kommer (I come)
Future tense
Jeg skal reise (I shall travel)
John vil ha (John will have)
Bente skal komme (Bente shall come)
So notice the rule for the present tense: you simply add an "r" to the end of the infinitive, no matter if it's you, he, she, they, john, etc.
And for the future tense, you just need a helping verb like
skal, vil, kan or ma.