The main thing that is preventing me from making a CWM for your device is that I don't know the partition layout. If I had that, it wouldn't take too much work to make one. Also, getting my WIP CM port working (obviously with only partial hardware support, which is the case for the P68x0 as well) on the i815 shouldn't be too bad either. They way I've set stuff up, most changes go in a common repository that is shared by 4 devices (the P68x0 and the P62x0), which the i815 would also inherit from.
Currently I don't really have the time to work on an additional device, but if someone who is familiar with deving is interested in working on the i815, feel free to PM me.