Here is my attempt at converting lklug sinhala unicode true type font to webfont and using it with @font-face css rule. IIRC this was done in 2011. Throwing it out there so anyone interested can play with it (I'm probably a bit late). (I used a step by step guide to convert which I can't remember/find now.)
Check it in action here
The reader part is currently broken becuase viewtext.org is down :(