1.
Do you need a CJK environment? Or just need the Latin environment?
Make Latin (or Latin variant) glyphs is easy, even will not to take too much time.
But draw CJK Words（https://en.wikipedia.org/wiki/Chinese_characters）
is a time consuming thing.
10px now only have about 500 cjk words. At least 10000 cjk words can provide good support to CJK environment.
(10px have the full support for japanese https://unicode-table.com/en/blocks/katakana/ and https://unicode-table.com/en/blocks/hiragana/ . if you only need to support for japanese and do not need hanzi, it's OK)
But if you only need Latin environment, I can even make one for you separately.
2.
Do you must require the Monospaced?
This means the glyphs must draw in the box with size 4x9 (top and right have 1px margin each, equal 10px halfwidth)
Notice the char: W,M
and there some chars in latin-1-supplement like:
Æ (u00c6)、æ(00E6)
In principle at least 5px can draw a Latin clearly. But 10px Monospaced only have 4px width, so have to omit.
But if you don't care monospaced, width will no longer be limited, readability will be better.
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I will take a little time to update 10px latin-1-sp blocks (Monospaced).
You can try it to see if meets your needs.