You are worrying too much. Pasta has been made with egg for hundreds of years. While the tools may have changed a bit, the process remains the same. There has been some actual scientific research on the amount of time salmonella can survive on stainless steel and other dry surfaces. You can google specifics. It is generally assumed that moist environments are more favorable to growth and sustainability. So, if you use a wet sponge from your sink, you are more likely to contaminate a surface from that, for example. In any event, the general consensus is that salmonella survives 1-4 hours on dry surfaces. One study in the International Journal of Food Microbiol. 2003 Aug 25;85(3):227-36.Survival of foodborne pathogens on stainless steel surfaces and cross-contamination to foods. Kusumaningrum, Riboldi, Hazeleger, and Beumer, transferred salmonella to stainless steel using a kitchen sponge. Salmonella enteritidis was recovered from surfaces for at least 4 days at high contamination levels, but at moderate level, the numbers decreased to the detection limit within 24 h and at low level within 1 h.
Practically speaking, you are going to make pasta then freeze or cook, rendering it safe. You'll dust off your pasta roller and put it in the closet for a while. It will be safe. Don't let this keep you from making your own pasta.
