CCD vs CMOS for tech camera, the Live View on the CMOS IMO is a total game changer for tech cameras. The 50MP back has a wonderful Live View and makes manually focusing both near and far object easy. The Phase solution has no peaking, the later versions of the Hasselblad, CFV II 50c I believe do, since Hasselblad added peaking to the X1D. The previous point of 16 bit advantage of the CCD backs, I feel is baseless. Sure the CCD backs have a "16 bit readout" but it's shown over and over that the last 2 bits, add nothing to the file and are basically nose. Just google this, and you will find plenty of debates, and info this dating back to 2011.
The CMOS 50Mp backs, all use the same chip, the 50MP Sony. However not all companies get the same capabilities out of it. All of them have the same crop factor about 30 percent over the "full frame" CCD and CMOS backs. Your 55mm lens will frame more like a 72mm lens, (believe I have the crop factor figured correctly). There will be considerable color cast on shifts but the LCC process in C1 can resolve most of it. Not sure how well the Phocus solution works assume similar.
If you are liking the 50MP, I would consider the following: CFV II 50c Hasselblad, Phase One IQ250 (350 if you can find a deal on one). The 50c has a tilting LCD, with touch which is something I would have loved to see on the IQ3 and 4, but Phase has yet to develop anything beyond the basic layout of the IQ1 backs. The 50c should also have an e shutter, which is a huge advantage for a tech camera as you are no longer limited to a copal or other shutter. The 50c is listed at 7.4K with the 907 faceplate that allows use of the X1D glass, I am sure there is a way to mount just the 50c to a tech camera. You can kill the dark frame on longer exposures also. The tilting screen option just adds so much more capability in scene setup, i.e. low to the ground camera setup can be hard to get your eye to the LCD on a P1 back, and being able to tilt the screen can aid with Live View and Image preview by helping to remove sun glare.
IQ250, old but still an excellent back, however I am sure that most you find will have a lot of actuations on them. One of the cleanest backs I ever used. It has wifi, which would allow you to use Capture Pilot to assist with focus and other image capture related issues. It will easily mount to any tech camera, and allows you a very good Live View for focus. The back will run for quite a while on one battery and the zoom to 100% to check focus on the LCD of the back is excellent. Still have a mandatory dark frame on exposures 1 second or longer. This can become quite troublesome in low light scenes especially where you are attempting to shoot a bracketed exposure as the back will shoot the dark frame before it frees up the back for the next shot, i.e. 15 second exposure and 15 sec dark frame.
The IQ350, adds a few newer features, but still no e shutter, which is a shame as all the other manufactures using this chip figured out a way to use the e shutter. ,
The IQ150, has the same image quality of the 250/350, albeit with less features, like no wifi.
CCD backs, IQ160, (stay away from the IQ260 as it adds really nothing over over the IQ160 at least in image quality and the 1hour exposures are IMO less than stellar). IQ180/280 are still great tools, give you a 20MP sensor plus image when you need higher ISO, past 400. No Live View, and it makes the use a tech camera difficult in the field for critical focus. Color is great and if can stay at base ISO, then image quality will be excellent, but for me the advantages of CMOS make it a better solution for a tech camera.
Hopefully you can work with a dealer and try out several of the afore mentioned backs with your lenses.
Paul C