need brake suggestion

Your only possible issue will be with the pedal rod length and that particular MC and adapter plate. There seems to be some variation there. My son and I went with the standard MC for that reason.... no issues with the standard rod length. You'll just have to try it.

Make sure you get the new MC bench bled 100% so that any low pedal will not be due to that.

As for the larger rear wheel cylinders, that will increase braking torque on the rear brakes. That can be good or bad... it all depends on where the front-to-rear brake balance ends up. Going from 7/8" to 1" ID wheel cylinders will increase rear brake torque by over 25%; that is a significant change. I would put in the new MC first, make sure things are all working right, and then go out on some gravel and try various braking pressures at lower speeds to see which end wants to lock up first before making any further changes.

If this is too strong in the rear (evidenced by the rears locking up in the tests on gravel), then you can correct with a prop valve in the rear line or by changing the front pads to a higher coefficient-of-friction material.