Slab
Occasional Tour Caddy
The pull and spring loaded tech may work, but the irons would all need to be a dual cog system like titleist and callaway to not effect the lie angle.
This would almost assure costs of £200-250 per club as we see with adjust utility irons
I agree with your guess at pricing (& why not, you're still buying clubs for a round of golf) Another reason mnfctrs shouldn't baulk at this 'idea' they really won't lose out financially