The command \DeclareMathDelimiter allows to define a delimiter which scales nicely with \left, \big etc. Now the problem I have is that I want to use a particular such delimiter from a different font, in my case the \llbracket and \rrbracket from the stmaryrd package. So the code for doing that would be
\DeclareMathDelimiter{\llbracket}{\mathopen}{stmry}{"4A}{stmry}{"71}
However, this requires the math font stmry which will occupy one of the precious 16 math alphabets as soon as one actually uses the command.
Since I don't need any other symbols from that font, I would like to avoid that. I managed to access a single glyph from other fonts as described e.g. in the answers to
grabbing a single Greek glyph from an alternative font in math mode?
but it is not clear to me how one can do that to get the above delimiter feature. Ultimately, I want to use the left & right version in combination with the \DeclarePairedDelimiter command from mathtools.
stmaryrdwith\usepackage[only,llbracket,rrbracket]{stmaryrd}? – A.P. Apr 28 '20 at 08:17