Alan Bowen
2. April 2017 um 20:19 via Postbox
Hi, Pablo—thanks for the suggestions. I was not able to get them to work. 
Here is my test file.

\definefallbackfamily[mainface][sans][NewGardiner][range=131FC,132F9]
%\definefallbackfamily[mainface][sans][NewGardiner-Medium][range=131FC,132F9]

\definefontfamily[mainface][serif][Brill]

\setupbodyfont[mainface,18pt]


\starttext

Hello world! 1234

αβγ

{
𓇼𓋹
}

and that is all.

\stoptext
There is a problem when you change the font size to a value which isn’t pre defined
(e.g. 14pt causes problems while 14.4pt works) and you have to add \definebodyfont[...]
(e.g. \definebodyfont[14pt]) to your document.

%\starttypescript[sans][newgardiner]
%    \setups[font:fallback:sans]
%    \definefontsynonym[Sans][file:newgardinersmp]
%\stoptypescript
%
%\definetypeface[newgardiner][ss][sans][newgardiner][default][features=default]

\definefontfamily[newgardiner][rm][NewGardiner]

\starttext

{\definedfont[file:newgardinersmp at 14.4pt]𓇼𓋹}

\switchtobodyfont[newgardiner,14.4pt]𓇼𓋹

\stoptext

Wolfgang