I want to make variable watchers go to a specific position using a single block.
I'm not sure I completely understand what you want to do, but it sounds like you should just have one variable containing a two-item list.
I'm pretty sure you're asking for a block that moves variable watchers to a position on the stage. This is not possible without javascript. I remember, there was a topic a few years ago (2019? 2020? idk) that talked about this, and a 2 people made scripts to do it (including @bh, or at least he shared a script). I have no idea if the scripts still work though.
Do you remember the Javascript?
To get around this issue, I made a text to costume reporter that can be used with a sprite to turn sprites into controllable watchers
I used it in my Mayflower project and it might be useful to you in yours
https://snap.berkeley.edu/snap/snap.html#present:Username=cymplecy&ProjectName=Mayflower_MAS400_V3
Contains other blocks to let you customise how they look
Very nice 
Equivalent using my blocks is
adding costume from command transform it into a costume... Don't affect pentrails!
a little bit slowly, but cool blocks
Yes - I don't actually use them in a forever loop like that without waits - they are fine for things that don't change quicky
If I just made them into one block like @joecooldoo , I could make it run faster but I like to keep the flexibility
Noice! This is perfect for my lazy self, thank you so much!