I've subclassed res.partner with delegation inheritance, and created a custom form view for the subclass.

class MyPartnerExt(models.Model):
    _name = 'my.partner.ext'
    _inherits = {'res.partner': 'partner_id'}

    ext_field = fields.Integer()

I would like to display the custom form whenever the internal link for the partner is clicked, and the record is an instance of the subclass.

So lets say the gdfgdfs​ partner above is an instance of MyPartnerExt, I would like to display the custom form. Otherwise it should display the standard form. 

Is this possible? Thanks in advance.

(ps. I've experimented with inheriting the form and adding/removing fields, but this gets too complicated for my actual requirements. https://www.odoo.com/forum/help-1/custom-view-based-on-res-partner-subclass-254782)