Another option: https://gitlab.com/Jitnaught/combatpeds-gta5/-/releases

It was used for some fighting scenes on YouTube:

Click the Report link on your mod and request that the tag be added.

I believe the key is M.

That was only for making the line shorter. Why the code is not advancing to the next stage could be of many reasons. We would need to see more of your code.

One thing you could do is add subtitles in various parts of your code, as a way to easily debug where your code is getting stuck. It may be getting stuck somewhere else in the code.

LINQ is the .All(...) part of that snippet. Make sure to add using System.Linq; to the top of your code.

To make it shorter, move the peds into a List<Ped> or Ped[] then use LINQ to check all of them.

if (lostPeds.All(x => x == null || !x.Exists() || x.IsDead))
{
    //next stage
}

Menyoo uses SET_TIMECYCLE_MODIFIER and SET_TIMECYCLE_MODIFIER_STRENGTH for "vision hax." Menyoo's list of timecycle modifiers can be found in TimecycModifiers.xml. A full list can be found here: https://github.com/DurtyFree/gta-v-data-dumps/blob/master/timecycleModifiers.json

Use dnSpy.

InitialHandle is used only within Menyoo, it is not something you can access outside of Menyoo.

There really isn't a great way I can think of to identify a prop that is in the Menyoo database. The only thing Menyoo changes about the prop is setting it to be a mission entity.
If this will be a completely unique prop, different model and everything, you could identify it using a raycast to "select" the prop.
If you know something about the prop will be constant, like the model or something, you could check for that in your script.