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 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.