[Avodah] Mincha

[Michael Elzufon]

R' Galsaba asked
<What it the Halacha about davening Mincha after Plag Mincha, and then
Arvit before Tzeit <Kochavim specially on Fridays during daylight
saving time?
[MJE] R' Marty Bluke answered
This called Tartei d'sasrei and is generally frowned upon by the
poskim. The Mishna Berura paskens that on erev shabbos you can be
mekil if it is difficult.

However, there is another lesser know issue with doing this.

There is a din that you are not allowed to start a meal 1/2 hour
before the time of krias shema which is tzeis hakochavim. tzeis
hakochavim is approximately a 1/2 hour after sunset (according to the
Gra), so you cannot start a meal after sunset. During the week most
people are mekil about this halacha and rely upon the fact that they
daven maariv with a set minyan every night (e.g. 8 or 9PM), however
Friday night this doesn't apply as you already davened maariv early.

[MJE] There is another heter that people rely on during the week and that is to ask someone to remind them to daven ma'ariv.  Why would not asking someone to remind to say kriath shema work here?