How much 4WD capability do you want/need?
If you just want a stock-ish 4WD Suburban then your best option is really to just go out and buy one. 92 was the first year of IFS 4WD on the Suburbans and I think it would be an expensive nightmare to try to retrofit the IFS 4x4 system onto a 2WD frame. We're talking about precisely locating and welding on the A arms mounts, crossmembers, etc. It just wouldn't be worth it as an entire stock-ish Sub could be purchased MUCH cheaper in the end.
If you are after serious offroad capabilty, if there is any such to be had from a Suburban (keeping in mind that I do own a 94 GMC K2500 4WD Suburban), then you'd be better off either buying an older model with the solid front axle and modifying it or converting your 2WD to a solid front axle. There are actually kits one can buy to convert the GM IFS trucks to SFA but I'm not sure how or if they would work on a 2WD truck. Any competent shop could perform this conversion for you but it will likely not be cheap. You'll obviously need a front axle, driveshaft, suspension system, transfer case, proper transmission, and likely need to have the rear driveshaft reworked. There would be a ton of other minor issues as well.
If your current Suburban is a half ton I probably wouldn't bother with either of those options as you'd end up spending a ton of money chasing down weak links.
The oil filter issue really isn't all that bad. Should just be an adapter that turns the filter sideways for front driveshaft clearance. No difference in the engine blocks themselves, that's just a bunch of hooey.
Another option could be to just lift your 2WD truck a little (there are kits for this), run some bigger tires, and perhaps swap in some lower gears and a locking differential in the rear end. It can sometimes be surprising just how much a 2WD can get through. But my rigs will always be 4WD.