TYPO3 Menu: Repeat parent link in first child - typo3

Question

I want to repeat the parent of a navigation as the first child of its child.
Example:
PARENT 1
-- Parent 1
-- Child 1
-- Child 2
---- Subchild 1
---- Subchild 2
-- Child 3
PARENT 2
-- Parent 2
-- Child 1
-- Child 2
-- Child 3
As this should only be the case in one menu, hence manually adding page links is not an option.
My current TypoScript is as follows.
lib.mainmenu = HMENU
lib.mainmenu {
1 = TMENU
1.expAll = 1
1.NO.stdWrap.htmlSpecialChars = 1
1.NO.wrapItemAndSub = <li class="menuopener">|</li>
1.ACT < .NO
1.ACT = 1
1.ACT.wrapItemAndSub = <li class="menuopener active">|</li>
2 < .1
2.wrap = <ul>|</ul>
2.NO.wrapItemAndSub = <li>|</li>
2.ACT.wrapItemAndSub = <li class="active">|</li>
3 < .1
3.wrap = <ul>|</ul>
3.NO.wrapItemAndSub = <li>|</li>
3.ACT.wrapItemAndSub = <li class="active">|</li>
}
Thanks!

Answer 1

So I found a solution, adapted from here:
lib.mainmenu = HMENU
lib.mainmenu.entryLevel = 0
lib.mainmenu {
1 = TMENU
1 {
expAll = 1
NO {
ATagTitle.field = title
wrapItemAndSub = <li class="menuopener">|</li>
stdWrap.htmlSpecialChars = 1
accessKey = 1
}
IFSUB < .NO
IFSUB = 1
IFSUB {
wrapItemAndSub = <li class="menuopener">|</li>
linkWrap= |
ATagParams =
ATagBeforeWrap = 1
stdWrap.htmlSpecialChars = 1
}
ACTIFSUB < .IFSUB
ACTIFSUB {
wrapItemAndSub = <li class="menuopener active">|</li>
}
ACT < .NO
ACT = 1
ACT {
wrapItemAndSub = <li class="active">|</li>
}
CURIFSUB < .IFSUB
CURIFSUB = 1
CURIFSUB {
wrapItemAndSub = <li class="active">|</li>
}
}
# second level
2 = TMENU
2.stdWrap.wrap.stdWrap.cObject = COA
2.stdWrap.wrap.stdWrap.cObject {
10 = TEXT
10.typolink.parameter = {field:pid}
10.typolink.parameter.insertData = 1
10.wrap = <ul><li>|</li>
20 = TEXT
20.value = |</ul>
}
2{
expAll = 1
NO{
ATagTitle.field = title
wrapItemAndSub = <li>|</li>
}
IFSUB = 1
IFSUB{
ATagTitle.field = title
wrapItemAndSub = <li>|</li>
}
}
3 < .1
3.wrap = <ul>|</ul>
3.NO.wrapItemAndSub = <li>|</li>
3.ACT.wrapItemAndSub = <li class="active">|</li>
}