fatoldfool: There's nothing to laugh about with the notion of having a solid, functional pistol in your outer coat pocket while you are out on the tractor. Join the club.
When I can wear my coat open I can carry one of my beaters in my waist band or in a belt holster and all is fine. As you know, as soon as you button up it disappears from both sight and any ease of retrieval. Also, even with a shorter slide I doubt you would notice any reduction in weight and you would still feel like you are lugging a full sized 45 around as an anchor in that pocket. I once had a combat commander and compared the 'heft' it and a government 45 (same size as yours) and I couldn't really tell the difference between the two - both seemed to weigh about the same, not at all like my aluminum frame commander.
There is also serious merit to your idea of just getting another gun, one that would fit into your outer coat pocket and if your farm coat pockets are anything like my farm coat pockets they could easily carry most anything, from a 4" revolver, snubnoses of course, small to medium frame autos like the smaller sigs in nice flat shootin' calibers like the 357 Sig, older mil-surps like the Makarov, CZ52s, or my favorite the Tokarev in 7.62x25. Some mil-surp 9mms should also work for you.
About the only thing that might concern you is how reliable the pistol/revolver will function after working all day and having a bunch of lint and crap load up your pocket and pistol. JMTCW. Mikey.