I think mine lifts about 4.5" on my 782.
If you move the whole thing forward and extend the input shaft in the gearbox, it will probably increase the load on the bearings enough to cause a lot of problems. I would not do that.
Two more feasible options: Sell it and buy the correct one before you cut it up any further, or do what JayBrd is doing and get a QA-42A mount and parallel links and use that instead.
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