So I did some testing... but you will need to do the same tests on your own system to see how it goes.
The characters show up as combined (when the combining character is put after the base character) on the command window when LiveScript is used.
The characters do not show up as other than boxes in the test I did here online, on the experimental facility to display results for you, but when I test on my Mac, the characters show up separately for all fonts except a few of the Lucida fonts (and then they show up as boxes.) I was not able to get the characters to combine on a plot... except by drawing multiple characters at the same position (but then they will not combine properly as the dotted circle will show up, which should not happen when a real combination is done.)
Please test this code on your own system, inside of and outside of Live Script.
FL = setdiff(listfonts(), 'Symbol');
tF = FL(fidx:min(NF,fidx+14));
ax = axes('Parent', fig);
text(1, K, fn + " -> " + S2, 'fontname', fn, 'interpreter', 'tex');
xlim([0 75]); ylim([0 16]);