Comparing apples to apples, the USA-made Sherline manual rotary table 3700 4" Rotary Table — Sherline Products is only $3.55 more than the import version marketed by Shars. The CNC-ready version is $56.05 more, but you wouldn't have to design and implement a motor mounting system; it's already done (they don't recommend trying to upgrade the manual to the CNC version). It's also more suitable to the Taig, weighing a lot less than the import table.
If the boring head you want to use has a 22mm x 1.5mm thread, you should be able to mount it directly to the Taig's ER spindle nose, but it might not have the torque to run at full extension in all materials; Taig's boring head only extends to 1.5".