That is just soooooo much like "The pencil I was issued in 6th grade is finally down to a useless nub, where can I buy an electric typewriter?"
Electric typewriters are indisputably useful, and in many cases more productive than pencils. But a replacement pencil is one heck of a lot cheaper than an electric typewriter. (Clue for the young: Typewriters predated computers for word processing. After 10 years of using manual typewriters, upgrading to an IBM Selectric with integral Lift-Off Tape correction ribbon was like being assigned to Paradise for sunset-watching duty.)
So, yes, you can get lathe toolholders for indexable inserts in sizes appropriate to your machine. You may want to avoid the most common "negative rake" styles, to be kindest to your machine and most similar to your existing HSS tools. But please get yourself a basic bench grinder or belt grinder, so you can (among other things) sharpen your HSS tools.