Coolant loss on charge circuit

Hi all
The chariot suffered the stone of death today and I now have a drive full of coolant and an empty charge circuit coolant tank and system.
I know it will cause higher IAT's etc however the question is this - Is it OK to drive still? The main coolant system is all OK. Looking at the diagrams it implies yes with the obvious get it fixed asap and no hooligan driving.

I know you have to have the system vacuum filled so trip to dealer / indy there, once again as it has no coolant in it and with the labour on this job high, I'm thinking replace the rad myself, ok on the spanners! and then let filling be done by others. Appreciate this blows the warranty cover on the part as not fitted by dealer but they won't cover the route cause of the failure anyway so not thinking i've lost out there!

The part comes up on the bmw uk shop site, no surprises but interestingly says about only in conjunction with new module carriers left and right and rock guards. Real OEM backs this up as well, so this looks like they are forcing you to do their 'upgrade' as the original rad is no longer available. More cost but with the benefit of the guards

Have BMW warranty but believe this is classed as wear and tear so not covered unless anyone knows better?

All advice and thoughts appreciated.