Change Script runtime with keeping reference

Hi i have problem with references between components I want to try modable game,and allow modding script i have few idea how it can be possible but for some o dont have tools or i dont know how.

I can create component instance from Runtime Loaded dll. There should be no problem. I can also replace old script by new script and also transfer all values

But there will be definetly case when i will want change a script which is referenced by some other script(s). And now i of course want to update that reference to new script

Possible options:

1) I have old object/scriupt and i would like to ask/findout if any other compoentn in scene has reference to it 2) I want find all components which has reference to that type of script i want change and i want check, and in some cases change that reference to new script

These twoo looks like nice solutions but i cant find any tools/possibilities in unity to do that way.

3) Somewhere save all referenece/all iportant referenece and check from that;

4) Every "script" will have somewhat method like checkCoponentAndReplace(Component old, Component new) which will replace odl component by new one

Point 4 is easiest one i think, but probably slowest one. There can be definelty some workarounds how to speed it up, but i dont see any when i will first load scene and i will need to change scripts to new one, any basically for almost all run some method(s) like this.

Any tips or sites when i can find better way?