Provided you can remain in VMC during the enroute cruise then you are right to go.
Alternates are based on the TAF/TTF not the METAR or ARFOR. The only time you can use an ARFOR for alternate requirements is NVFR/IFR situations which I don't think are applicable to day VFR.
Calling it a day is generally not an option when you are paid to fly unless there is a cyclone or something equally as devastating in the area. Getting some experience in (with an instructor initially) some less than ideal conditions gets my thumbs up if you are going to be a professional pilot. The first time you fly in such conditions you don't want fair paying punters up that back!