Is there a way to have multiple of a character in defsrc without repeated declaration errors?

[IndigoGollum]

Currently, trying to remap a keyboard with multiple copies of some keys (like a number row and a number pad) leads to Kanata complaining about a key appearing twice in defsrc. My first thought for how to solve this was changing my number row to some arbitrary characters in XKB and defsrc like what's suggested here, but it seems putting special characters (anything S- or an alias) in defsrc makes a configuration invalid, and of course using a normal character would be another repeated declaration.

Has anyone found a solution to the repeated declaration problem or another way to remap things like number pads?
If it helps, here's the layout i'm currently working on. I'm trying to put some extra functions on my number pad's higher layers.

[CosmoDm]

You can use Numpad or kp prefix or just add the Unicode symbol 🔢

(defsrc
 🔢₁ Numpad2 kp3
)