The following is a list of 290TD engine variants from EPC. The object here is to mate a 711.113/117 trans to this engine.
602.980 - Sprinter
602.981 - U90/U100 flywheel may be SMF: A6020302705 / A6020302605 ( from EPC: for double plate clutch??? )
602.982 - Sedan
602.983 - G Wagen
Looks like the Unimog U90/U100 Turbo version flywheel may be SMF attaching to 711.612 trans. You will need to do more investigation. Not much of these models in the market. But prices should be cheap from MB since there aren't much demands.
The other approach is to search: "dmf to smf conversion kit sprinter" and also on ebay. Call the vendors and ask for a kit for a sprinter w/ any of the engine specs above. I dont see much for 290TD but a lot for OM612 ( 270CDI which share the same bell housing shape ). For the OM612 flywheel, it may work but you will need to delete lots of tabs and leave the relevant ones. I assume the tabs line up the same for OM612 / OM602.98x. Here is one: https://www.batenweb.com/index.php?main ... _id=269470
If you look at the flywheel, the tabs are spaced out about every 10mm.
In any case, for the above 2 solutions, You will need 240mm or 260mm diameter clutch w/ 10 splines. BMW has lots of options.
Ripping the current IP and replace w/ a mechanized one is silly. You have one of the sought after G model. I only mechanized my pump since I dont have a stock G w/ 290TD.
If you are welding on the tabs to the flywheel, I would spend the time getting a custom trigger wheel done. It's for the sake of the next owner! Swapping out to another Wolf flywheel should be easier too. Tons of fab vendors around that can do custom trigger wheels ( may be not near you ) It might be OK to have it mounted on the crank before the flywheel if the metal is not too thick and have the tabs bent to create more surface area. Trick is to have the w/ same distance to the pickup sensor ( 2mm gap? )
Most folks go w/ 716.xx trans from a sedan. I have a leftover used DMF flywheel/clutch/pressure plate along with the shifter ( single rod ) after I sold off my 716.xx trans. UK forums should have more infos for the conversion.