I get that this might be subjective since 略字 themselves originated (mostly)
subjectively, but are there any rules for being able to create/use new ones?
For example, the [广+マ](https://japanese.stackexchange.com/q/78677/78)
representing 魔 or 摩 is quite common. [This blog
post](https://soranews24.com/2017/02/02/w-t-f-japan-top-5-most-ridiculous-
kanji-handwriting-shortcuts%E3%80%90weird-top-five%E3%80%91/) shows 木 + ｷ to
represent 機 (which I've seen), but it also shows 艹+ヤ for 薬 (which I hadn't
seen).

So can you just make up and use something that would be easily recognizable?
Like the other night I was having trouble remembering the stroke order for 華.
I thought, "Could I just write 艹+カ for 華・花? And would people understand it?"
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kanji abbreviations
Are there rules for "pronunciation" 略字?
Something like "木+キ" is an outdated convention used before 1970 when no one
had a computer (the tweet clearly says how retro it looks). "广+マ" and
"simplified 門" are still sometimes seen in manga, but I feel even these have
started to look a bit old-fashioned now. As for others, you should not use
them unless you are making an early-Showa film or something. It is not
recommended to create such abbreviations simply because some kanji are hard to
remember. If you use "艹+カ", young readers probably can't even understand what
you are trying to do. In most cases, you should [simply use
kana](https://japanese.stackexchange.com/q/19491/5010) (or if you're feeling
adventurous, [invent a KY語](https://japanese.stackexchange.com/a/69906/5010)).
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> So can you just make up and use something that would be easily recognizable?

Theoretically you can, but practically that sort of creating kanji is not
productive (like other ways of creating kanji). That is, it is unlikely to be
understood.

More precisely, there is nothing official about the kanjis of that sort, so
you could create a kanji like 艹+カ, but it is a different matter whether people
understand it (which should have been the case in China thousands of years ago
when original kanjis were made anyway).

* * *

As [this](https://anond.hatelabo.jp/20180513144030) says, those kanjis were
mostly used/understood in specific circles.

> 薬の略字で草冠にヤ
>
> 機の略字で木偏にキ
>
> 議の略字で言偏にギ
>
> 館の略字で食偏にK
>
> 厩の略字で雁垂にQ
>
> 図書館の略字で国構えにト

Some others I found by googling include : ⼫＋ソ = 層；⼴＋K ⼴＋O = 慶應 (a major
university).
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