Clip-on filters for IR and Astro on full spectrum

I'm having my A7R modified to remove the IR/UV filter so I can have a play at some infrared imagery. Rather than have a fixed filter added I'm going the route of it being full spectrum and then using clip-in filters from the likes of STC or Astronomik. A brief search of the forum I couldn't find any reference to either. Might be my inability to search this forum well (STC returning lots of mentions of poSTCards and fellow dyxummer weSTCoast ), but thought I'd throw it out here.

So, my questions are:

1. How have people who use these filters found them? Any issues or drawbacks? Any things to be aware of by brand?
2. For infrared (probably 720nm), any brand recommendations?
3. For night sky, again any recommendations?*

*this last point has taken me down quite the rabbit hole across many astro forums where this is discussed. I'm not currently planning on delving too far into true astro photography (images of nebulae, star tracking mounts etc.), more looking at catching better images of milky way and starry nights. As I understand it, at minimum I'd need to re-add the IR/UV filter to avoid 'star bloat', but rather than going that route, I suspect a light pollution filter which also filters out >700nm would not only avoid the 'star bloat' but also provide better images of the night sky overall. The ones I've been looking at are:
A) STC astro nightscape
B) STC astro multispectra
C) Astronomik CLS-CCD

From what I can tell:
The Astronomik only lets through roughly 450-520nm (to allow 486nm H-beta and 496 & 501nm OIII) and 640-690nm (to allow 656nm H-alpha). All other wavelengths are filtered out.

Both STC astro filters filter out the same wavelengths, just with the multispectra getting transmission of removed wavelengths closer to 0% transmission, vs circa 30% for the nightscape. But the STC bands have more peaks and troughs. From what I can tell, STC lets through roughly 400-430nm, 440-540nm, 550-570nm and 640-690nm. I *think* allowing through 550-570 is to let through the green of aurora borealis (558nm), but not sure about the others.

Apologies, a lot to unpick there, but ultimately I'm trying to work out which clip-in filters are best. I suspect I should probably point some of the above questions to the astro forums I've discovered, but before I demonstrate my naivety in a new world of experts, I thought I'd approach it here first

Hi
I have a IR cut strong filter from the Minolta Dimage 7. I'll be in Twyford next Thursday and can take it if you want to give it a try. Still have to find it first. I believe it's a 62 or 67mm