Would it be possible to implement these professional equipment not as one time cost, but as resource that is used in production. For example you would need 1 tool per 1 lumberjack per 10 turns. These numbers are random and can and should be changed to balance things out.
And now, if you don't have tools/guns(hunter)/artisan equipment you either get malus and smaller production by 10%,20%..50% (depending how long your worker use old and damaged tools) OR providing right equipment is increasing production by certain amount.