Is it permitted to bring in Shabbos early during the 9 days and make Kiddush? I know that the prevailing custom for Havdallah is to do it over something other than wine, but obviously this cannot be done for kiddush on Shabbos evening. Is there any connection between these, or are they totally separate because havdallah occurs after Shabbos is over, while Kiddush occurs when you have already accepted Shabbos?
On Shabbos there is no restriction against eating meat or drinking wine even if one began Shabbos early - any time after plag ha-Minchah.
We see from here that you can make Kiddush early.
This is Gershon Gold’s answer to the question Avrohom Yitzchok linked above.