Placing Ilustrator graphics in Indd - RGB or CMYK?

Hi hope you can help. I'm making an A1 poster of a compilation of about 50 drawings I've done in Illustrator, placing them in Indesign. Output will be a Press PDF. No text or bitmaps in the .ai files, 100% vector, bright colours on black. They all have Outer Glow enabled. My question is it is best to leave the Illustrator files in RGB and let Indesign convert to CMYK on output, or save the vector .ai files in CMYK colour space? RGB does seem to give a more favourable beighter colours and glow effect (on screen!) but I always thought when preparing for print one should work in CMYK from the outset, especially ally with vectors? I want my blacks really black and all matching so currently have all the ai files set to cmyk with the blacks at 60,60,60,100. So I could go into each one and change to RGB, but retaining my cmyk black. Which will take ages so unsure if its worth it?

I am more concerned with vibrancy than I am with colour matching. If the final printed result is brighter using RGB illustrator files I'll do that though. Unfortunately the size of the document and time required makes printing a proof of each just to have a look quite expensive. Thanks so much for any help.

PS Aware this might be more a question about how Indesign handles colour conversion than Illustrator so apologies if I'm in the wrong place!