It is not actually close to MTOW so nothing to worry about there
Its right on the limit, MTOW is 3.5kg with what I assume was a TB47 and X5 is 3.4kg.
Add in the extra weight of the X5R.
Some lenses weigh more than stock.
If you're going to fly a £5000 rig with no redundancy, at least make sure its not breaking a sweat. The inspire X5 is in the red from the second you take off and that's with the new motors.
Add in the X5R which is heavier due to SSD and extra housing and you're in trouble, no doubt DJI will try to sting everyone with a new revolutionary propulsion system closer to the time, as they seem to enjoy revising the inspire every 4 months.
While I thought about the X5R but I decided to go with the X5 for a number of reasons. First, the cost differential of $1500 or so is a bit hard to justify. Second, the additional weight penalty, though I'm not worried about it pushing the MTOW, I do not wish to sacrifice flight time any more than the X5 does over the X3. Also, if, or perhaps, when you crash replacing the X5 would be bad enough -- replacing the X5R would be that much worse.
I do wish the X5 had a higher maximum bit rate -- 60Mbps is decent, but 100Mbps would be even better. I do hope they up the max bit rate on the X5.
So, instead of getting the X5R I'll invest in more batteries, the SPC4500 4 battery charger and some other accessories like a prop balancer.