Sony A7CR full-spectrum and astro conversions: IR leak or not?

I got a deal on an A7CR, and I'm looking to make it my second body & astro conversion. My primary body is the a7rV, so this ensures consistency of sensor, while not needing the massive FPS for astro timelapses.

I'm hearing completely different recommendations from 2 conversion services (Spencers and Kolari), so I'm curious if anyone has experience or the real verdict.

Spencers is not recommending the a7RV (and extension the A7CR) for full-spectrum conversion, since there's the internal IR light that leaks / ruins all photos. They also offer additional heat reduction.

Kolari support said that it's no problem whatsoever, and they haven't experienced IR light leak on their full-spectrum conversions. Kolari says that added heat reduction is no longer needed on modern Sony bodies.

Right now, my inclination is to do the Spencers H-alpha conversion and pair it with the Kolari OEM Sony mirror (drop in), to restore regular daytime / non-astro functionality.

Are there any arguments to doing the full-spectrum instead? Cost is about the same. I like the infrared photography optionality, though I expect to use IR very infrequently (vs daytime & astro). I suppose the next variable would be Kolari's drop-in H-alpha filter introducing astro artifacts with wide-angle lenses, no?

Thanks for helping me get to the bottom of this. Sony Professional Services was equivocal and wouldn't confirm whether there's the wayward IR internal light or not.