ComeCloser supports Vive Trackers for the tracking of the pelvis and the replication of the masturbation.
According to our players, you can reportedly use SlimeVR to simulate Vive Trackers and everything works correctly. Though we do not have tested this solution ourselves and can't provide any assistance.
Also please note that SlimeVR is a movement based solution and your SlimeVR devices are not tracked in absolute position (unlike the Vive Trakers). Therefore, some drifting may occur.