I've run Iridium plugs in other motorcycle engines and they do make a difference in driveability. You should be able to find the cross reference you need and they are certainly worth a try. I wouldn't worry too much about adding the 5k plug resistance to the plug wire resistance, with the Iridium's narrower plug tip, they don't take as much voltage to fire.
I used them in some first generation Goldwing's which had point ignition with no issues. I also currently use them in my Harley and there is a noticeable difference ( to the better ) between them and the stock plugs.
So go ahead and try them.
1971 R50/5 Cafe Project
2013 DL650 Adv