Looks like you have the rear rockshaft for a plow in place. I don't see any reason you couldn't use that rockshaft for the lift of a 3-point. In fact, thought about doing the same myself but never got to it. There are limitations to the exhaust lift you need to keep in mind.
1) It does not have the strength of a hydraulic system. Lift capacity will be limited. It may have trouble with one of the heavier mowers that the tractor can otherwise handle. A lighter duty mower shouldn't be a problem. If you let the rear of the mower run on a tail wheel and just hold the front with the lift (which some people do anyway) it should handle any mower the tractor can handle.
2) The exhaust lift isn't capable of much depth control. Trying to carry a load on a compressed gas (that is hot going into the cylinder then cools) will not work well. These systems were typically used to handle simply UP or DOWN. Operating control was normally handled with some other mechanical means. For a mower, you could probably use a chain to set your normal mowing height then use the exhaust system to lift it.
As to your PTO not being centered, the simple answer is that if it didn't work, it wouldn't be there. The offset PTO does require some consideration, but mainly it is a potential problem with pull-behind equipment. A 3-point machine usually works with no problem. You need to make sure the drive shaft is assembled with the u-joints timed, but you need to do that anyway. You may have to limit how high you raise the mower while it is engaged as raising it will increase the offset of the shaft.
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