Hello everyone!
Thank you for an awesome free and open-source font!

It would be nice to have a full set of symbols of playing card suits in Inter: ♠, ♥, ♦ and ♣. Currently, the only available symbol is "♥".

I'm completely ignorant about fonts, but after several days of suffering, with the help of FontForge I've somehow managed to add suits symbols to Inter from the fontNoto Sans Japanese

But there were way too many warnings and errors on editing and saving like these:
The glyph named Iota is mapped to U+0196.
But its name indicates it should be mapped to U+0399.
The glyph named uni021A is mapped to U+0162.
But its name indicates it should be mapped to U+021A.
The glyph named rrthook is mapped to U+E05D.
But its name indicates it should be mapped to U+027D.
The glyph named rdescend is mapped to U+E05E.
But its name indicates it should be mapped to U+027C.
The glyph named uni0326 is mapped to U+F6C3.
But its name indicates it should be mapped to U+0326.
The glyph named uni25CE is mapped to U+0298.
But its name indicates it should be mapped to U+25CE.
The glyph named uni05DA is mapped to U+02AA.
But its name indicates it should be mapped to U+05DA.
The glyph named uni05DD is mapped to U+02AD.
But its name indicates it should be mapped to U+05DD.
The glyph named uni05E5 is mapped to U+02B5.
But its name indicates it should be mapped to U+05E5.
The glyph named uni200D is mapped to U+FEFF.
But its name indicates it should be mapped to U+200D.
The glyph named uniFB47 is mapped to U+02DF.
But its name indicates it should be mapped to U+FB47.

And I have no idea what they mean and how to fix them.

And there's a question of licensing; I don't want Rasmus or Google to sue me for combining their fonts.

Due to all these things, I'm afraid to use this modification of Inter on my website.

But in my humble opinion, it looks pretty nice:

So, is there hope that in the future, someone more knowledgeable than me will add ♠, ♦ and ♣ to Inter?

Many thanks!