It seems to be a real catch22 - do it now and the redo it all again in 4 weeks.
Or choose not to and then run the risk that it does not work as it is supposed to and then have the potential chaos to put a stop-gap in place to keep things running.
There is still additional drilling etc needed - and this can only be done after the change - I would prefer to do that now whilst all tools are at hand.
Guess that answers my own question . :-)
