I have a JD i-Match quick hitch on my 3ph. If I take the pto out of gear, I can put the tiller on in about 3 minutes or less. Taking it off is under a minute, and I'm not hurrying.
JD made an "A" frame style quick hitch that should fit your 425 if you switch to the mechanical tiller. Is the hydraulic tiller that much work to connect?
That is what I am trying to figure out. I don't have a tiller yet, but my sense is that the hydraulic units are more time consuming to put on because you have to mount a hydraulic drive pump under the frame on the PTO. Based on the comments it seems like a quick hitch and a rear PTO may be the faster way to mount up and in a pinch I could till with the mower deck on if needed, which I don't think I could do with a hydraulic tiller.
The quick hitch seems to solve the main problem I have had on my bigger tractors which is that it is a 20 minute job trying to get a 450 pound tiller to line up properly to insert the pins, aside from the fact that I fear for my fingers every time I do it.