I have converted one lens using the Leitax K mount - a Contax Carl Zeiss. I justified it by comparing the purchase price + mount cost + conversion to be less than a new Zeiss ZK lens or a Pentax FA Limited - equivalent lens quality. Actually is was about 1/3 the price - primary due to the high costs of the comparable lens. The conversion turned out very well, and I really like the outcome. Personally, I would do it again - given that the economics were judged to be the same.
Here is the link to the Zuko to Pentax K mount conversion by Leitax. Its 62 euros or $88 USD.
Having said all of that, a new Zuiko f1.8 50mm lens goes for about $120. A new Pentax 50mm f1.4 goes for $299. If you convert it, it would still be an all manual lens, manual aperture and manual focus. You can pick up an equivalent Pentax M 50mm f1.7 on ebay for about $90 or a bit more than just the Leitax K mount. I guess it comes down to the character of the Zuko images.
The only person that can determine the worth is you.....