No ComposeKey sequence for ≈ (almost equal) and ≅ (approximately equal)

I don't know much, so forgive me if I use the wrong terminology.

Problem:
There is no ComposeKey mapping for the symbols ≈ (Unicode 2248) and ≅ (Unicode 2248) in Compose Tables.

Details:
According to https://help.ubuntu.com/community/ComposeKey the files such as /usr/share/X11/locale/en_US.UTF-8/Compose have all ComposeKey combinations to type special symbols, characters and graphemes.
Two standard graphemes (≈ and ≅) seem to be missing from multiple compose files although their negated versions (are present mapped to compositions

Solution?!: I propose this (but wouldn't know how to commit it except by filing a bug - if it's straightforward to improve Linux, then please tell me how! I'd love to commit something to the code!
I added these lines to a copy of the compose file that I made at ~/.Xcompose
I propose that they should be added to the multiple, original Compose files in:
  /usr/share/X11/locale/en_US.UTF-8/Compose
  /usr/share/X11/locale/iso8859-1/Compose
  /usr/share/X11/locale/iso8859-15/Compose
     etc etc etc

# _________________Added by Jackalux_____________________
<Multi_key> <asciitilde> <equal> : "≅" U2245 # APPROXIMATELY OR ACTUALLY EQUAL TO
<Multi_key> <equal> <asciitilde> : "≅" U2245 # APPROXIMATELY OR ACTUALLY EQUAL TO
<Multi_key> <asciitilde> <asciitilde> : "≈" U2248 # ALMOST EQUAL TO
# ____________End of Jackalux's additions________________

Notes:
The list at https://www.x.org/releases/X11R7.7/doc/libX11/i18n/compose/en_US.UTF-8.html also misses combinations for ≈ and ≅ . Perhaps that should be updated too if it is a reference list.

I also wanted to add:
<Multi_key> <equal> <asciitilde> <slash> : "≇" U2247 # NEITHER APPROXIMATELY NOR ACTUALLY EQUAL TO
<Multi_key> <asciitilde> <equal> <slash> : "≇" U2247 # NEITHER APPROXIMATELY NOR ACTUALLY EQUAL TO
<Multi_key> <slash> <equal> <asciitilde> : "≇" U2247 # NEITHER APPROXIMATELY NOR ACTUALLY EQUAL TO
<Multi_key> <slash> <asciitilde> <equal> : "≇" U2247 # NEITHER APPROXIMATELY NOR ACTUALLY EQUAL TO
<Multi_key> <asciitilde> <asciitilde> <slash> : "≉" U2249 # NOT ALMOST EQUAL TO
<Multi_key> <slash> <asciitilde> <asciitilde> : "≉" U2249 # NOT ALMOST EQUAL TO
But I've realised that they create clashes with other compositions, as the composition forms before the ComposeKey is released.
If this can be corrected and added at the same time, then that would be amazing as I don't know how to access the actual compositions listed for those characters.

Co-operatively,
Jackalux