Making a gaiden chapter in a FE8 romhack

[sniperserpent]

I'm working on a FE8 romhack in FEBuilder GBA as a personal project. It's my first time making a romhack, mainly just to have a small thing to be made

I'm trying to make there be a Gaiden chapter after one of the missions. I made the map over map 44, which is one of those maps that exists for cutscenes that's not a real level, assuming this was space that wouldn't matter to use since I'm not using those cut scenes. 

However, I've realized the start event for this map is 9FF354, which is shared by other cutscene maps.  I have already used event 9FF354 for another cutscene in my romhack, so editing a level start even there will mess with my existing cutscene.  I realized this after doing level design and enemy placement for this chapter. I wanted to ask:

 

1. Is there a way to change the address a levels start event is to a new event?

 

2. If not, is there a way to copy the map and enemy placement i've done to another chapter so i don't have to recreate this all manually?

 

3. Is there a general best practices in FE8 hacking around dealing with these non-map cutscene levels that there's so many of? Will messing with them cause any other unexpeted problems?

Edited December 27, 2022 by sniperserpent