I am afraid that you will not be able to do so using the ListInstance Feature, ListInstance will only allow you create a List based on the Existing List Template. But you can try create a new Schema for the list and You need to do that in the schema.xml of the List. At the end of the schema.xml file you will see a entry as below
<Forms>
<Form Type="DisplayForm" Url="DispForm.aspx" SetupPath="pages\form.aspx" WebPartZoneID="Main" />
<Form Type="EditForm" Url="EditForm.aspx" SetupPath="pages\form.aspx" WebPartZoneID="Main" />
<Form Type="NewForm" Url="NewForm.aspx" SetupPath="pages\form.aspx" WebPartZoneID="Main" />
</Forms>
This dictates the list of forms the List has. You need to add another form you can make another entry say for example
<Form Type="NewForm" Url="NewForm2.aspx" SetupPath="pages\form.aspx" WebPartZoneID="Main" />
You will get another page NewForm2.aspx, UI will be as per the File form.aspx that is present in the location C:\Program Files\Common Files\microsoft shared\Web Server Extensions\12\TEMPLATE\Pages, You can copy form.aspx and make changes to that and point the SetupPath url to the new file. In case if you want to create a new View page you can do so using the tag of the Schema.xml