There’s no direct conversion of D&D adventures to RM. the HP attrition in D&D doesn’t exist in RM. throwing multitudes of Kobolds and goblins at PCs and multiple random and nonsensical monster encounters in woods or dungeons doesn’t really work.
I’ve run entire D&D and Pathfinder campaigns in RM as concepts or frameworks but stripping out 90% of the encounters monsters critters and the ubiquitous- open door A you meet an Owlbear and then open door B it’s a oddly placed Ogremagi.
Have a look at the module, keep the core idea, develop an adventure that makes sense then create 1-3 encounters for the group.