SiddhaαΉ xkb layouts ("symbols") using the SiddhaαΉ unicode block, based on DevanΔgarΔ« layouts.
sudo cp output/xkb-in.siddham /usr/share/X11/xkb/symbols/in-siddham
setxkbmap us,in,in-siddham -variant colemak,bolnagri,bolnagri -option "grp:alt_caps_toggle"
The Devanagari symbols have just been mapped to the corresponding Siddham symbols, some Siddham characters may not be included if there is no corresponding Devanagari symbol for it, and some Devanagari symbols may not have been translated if there is no Siddham symbol for it (e.g. ΰ₯ ).