No Problem C-Hing, I have had the same experience to.
When the rubber and rim start to split, I used Lexan Car body Repair Glue (can buy in any RC car shop in KWS) to apply around the join between the rim and the rubber. It does not look nice but it works very well. I tested this technique on both Tamiya Rubber tyre and RIDE rubber tyres, as rims from both brands are brittle (easy to crack).
Once the glue dries, because it is slightly flexible, it stretchs a bit with tyres. So far all my repaired tyre/rims worked to the end of life the tyres (worn till hole comes thru).