A shul in my city made an early maariv for the 2nd day of yom tov. Knowing who the Rabbi is, he did not do this out of ignorance. There are 2 issues I am unclear about:
Are there contemporary sources that allow switching your mincha-maariv cutoff even in the absence of adding kedusha (Tosefes). (This would be less of an issu if the 2nd day were shabbos or early maariv on the first day if you hold there is a mitzva of tosefes for yom tom)
How does this circumvent the hachana issue. Granted you accepted the 2nd day, but that shouldn't negate the first day in terms of melacha, especially since they are 2 kedushas.