The attached save file contains a data pack that adds functions to create wall signs with large format lettering. I updated it from my previous version to correct changes to sign formatting syntax and unicode character spacing. Also added new wood variants and ability to choose colour of text.

To use call functions in command line

For acacia wall signs use /function bsign:aca/

For bamboo wall signs use /function bsign:bam/

For birch wall signs /function bsign:bir/

For cherry wall signs /function bsign:che/

For crimson wall signs use /function bsign:cri/

For dark oak wall signs /function bsign:dar/

For jungle wood wall signs use /function bsign:jun/

For mangrove wall signs /function bsign:man/

For oak wall signs /function bsign:oak/

For spruce wall signs use /function bsign:spr/

For warped wall signs /function bsign:war/

Follow wood choice with colour 0-9, a-f (minecraft colours 0 = black, f = white etc.)

Data pack contains upper case A-Z, numbers 0-9 and various other characters.

ie.
/function bsign:oak/0/a
/function bsign:dar/7/b
/function bsign:aca/5/c

Other characters are

&  and
'  apostrophe
*  asterisk
@  at
(  bracketleft
)  bracketright
¢  cent
^  circumflex
:  colon
,  comma
-  dash
$  dollar
=  equal
€  euro
!  exclamation
`  grave
>  greater
#  hash
{  leftcurly
<  less
%  percent
+  plus
£  pound
?  question
"  quoteleft
"  quoteright
}  rightcurly
;  semicolon
\  slashback
/  slashforward
[  squareleft
]  squareright
.  stop
~  tilde
_  underscore
¥  yen