Rollei Digibase C-41 colour chemicals are also sold as single separate baths, so maybe - if one finds them - the better solution to long-term conservation problems is to buy only the baths which are needed instead of buying a new kit any time.

The only shop I know so far which sells these chemicals as single baths is General Photo http://www.generalphoto.biz in Germany.

The important news is that the single bath are sold by the factory. Maybe you can ask Rollei about sellers in that part of the planet.