What about a wavetable synth, like an older model from Waldorf. Could that be done ?
Considering the popularity of WT synths today and this synthesis type in general, I would say it is a medium difficulty task.
Wavetable scanning is just reading the pcm data from the 2D array defined by some algorithm or external variables. The most complex parts would be tuning it to sound musically, like choosing the right parameters for interpolation, constants for scanning, behavior on fast modulation of the wt-position, etc (i.e. Brilliance or Noisy parameters in Waldorfs, probably existing in other synths but named differently).
And it’s only the oscillator part. I easily can imagine 2 years of R&D on such a thing even for a big company