Lock position of vessel A relative to vessel B during timewarp

[lo-fi]

Good evening! This is a long shot, but as the title says. I've got them connected by a joint, (but not docked) in realtime. Obviously, as KSP treats them as the same vessel, when time warp hits they drift apart. There may be no solution to this, other than "dock them for timewarp", but it's worth an ask.

I've fiddled about with a few things - setting positions or whatnot - but most seem to get overridden by the flightintegrator. I tried disabling it, then remembered about the KrakensBane stuff when things hilariously shot off a speed

Any pointers? Even a little in depth knowledge of the on rails system may prove helpful, so please chime in with info if you have any. I couldn't find a huge amount through searching.

Thanks