Mupen outputs a 240p image when the game is 224p because of Overscan Cropping

[ZELDARCHIVE]

Hello.

Majora's Mask uses a native 320x240 resolution, but because of black bars around the screen I'd like to use the Overscan feature to crop 8 pixels top & bottom and 11 pixels left & right.

Making the final picture 298x224.

(I chose 8px because it seems to be the standard, and 11 because I wish to keep the picture 4:3 ratio)

HOWEVER after using the Crop Overscan feature the ENTIRE image gets "rescaled" to a weird 224p game with a 240 pixels grid.

The "224p" part is correct but why mix it to a 240p output??

All I want is to have the Crop Overscan setting to just CROP, not "crop and divide the screen with 240 lines of pixels when there should only be 224 of them".

01. What the game looks like Native with no Crop:

https://i.imgur.com/Pmyzeqy.png

02. What the game looks like using the Crop Overscan feature (Mega blurry picture when I never asked):

https://i.imgur.com/7Uj6nxk.png

03. Still 240p picture but the "Native Resolution Factor" has been set to x2, which definitely helps but does NOT solves the problem at all ("Off" and "x1" doesn't help whatsoever):

https://i.imgur.com/VvJUWRc.png

04. Same as above, but  "Native Resolution Factor" is set to x3 here which I found is the sweet spot to get a final picture as close as the original. Still doesn't fix it though:

https://i.imgur.com/f98OoKE.png

05. What the picture SHOULD look like. Done via editing with Gimp:

https://i.imgur.com/z90BDjr.png

You can also find the "bundle" of pictures here:

https://imgur.com/a/REF3GC0

Please help, having the Crop Overscan option to destroy the final picture makes using Shaders completely ineffective and quite honestly, this problem didn't even need to exist in the first place.

Not to mention every single game needs to have borders cropped making this an even bigger issue.

Please help. Thanks.