Fallschirmjaeger
the CZ550 blades should do the trick for the front sight, the hardest will be getting an original rear sight. You never know you might be able to scrounge up an old shot out barrel for either a ZKK600 or 601. The ZKK's were pretty common in Canada, not so in the US.
Daryl here in this forum might be able to help locate one in that regard.
Winchester here in Oz stocks some parts - have to go thru a gunsmith, but whether they export may be another issue altogether

https://www.winchesteraustralia.com.au/categories/_Winchester/PA/PC/PC12?q=&per_page=12

ZKK601 front sight
https://www.winchesteraustralia.com.au/products/5240-0321-01

If you can't get the back sight I would just fit a blanking plate for the rear dovetail slot & just use the front blade & rear peep - very fast to use & easy to adjust.
Another option would be to get a similar express type rear sight milled to fit.
Best of luck mate, they are a wonderful rifle - the peep alone is a work of art alone!
Search amongst the forum here for ZKK's - there is quite a few blokes with them here - Tilleyman I think is one.