Has anyone had any experience as an Emergency Preparedness Liaison Officer for the Army Reserves?

Haven't seen a response yet, but on the Navy side, I worked with a number of NEPLOs when one of my collaterals was N-4 for the Regional Ops Center Northwest. They in turn worked with their Army counterparts. The key thing for any EPLO is being the communications bridge in these combined ICS efforts. When NEPLOs worked for me, I made sure they came up to speed quickly on FEMA ICS coursework. There's a bunch of web based stuff and then schoolhouse (Usually 800 Series stuff for sure). I'd be shocked if there wasn't a long pedigree shopping list for those positions.

The other thing is there is no substitute for real experience. I ran a hunk of the Haiti Earthquake and Fukushima events. Nobody outside the services understands JOPES, however you have to learn whatever is used now. Given we were also retaining custody of Strategic Assets, we also had varied exercises either run by us or DoE; some of them costing big bucks. Those are a very different animal which I pray we don't have to get actual experience in. BTW, keep your Spider Sense out there with anything NORTHCOM. They were a disaster and pretty much were professional interferers when we were evacuating Misawa back to CONUS. Hopefully they're better now as a number of years have passed. Another pancake was 82nd in charge of Haiti who had nothing other than JOPES knowledge. 101st was much more skilled at the time, but I presume the OPTEMPO precluded their assignment. Lot of wasteful flailing around in Haiti.

I hope the ELMRs interlinking has been sorted out. Nothing worse than being unable to communicate. EPLO work is critical but underappreciated and difficult to get quality paper to compete with your peers for promotion. I made sure to have flags sign off on serious paper for my folk who stepped into the breach. The ROEs for Haiti basically guaranteed you used a foreign contractor to chop down bandit bands. I always had two security types with shotguns assigned to every two person Damage Assessment Team. The locals learned quickly.

I worked with the EPLO teams in my final assignment with NORTHCOM supporting Defense Coordinating Elements in several regions. All the Services have an EPLO Program but they differ slightly as to how they are managed and employed. The Army has billets identified as part Regional EPLO Team and ones that are on State teams. The State EPLOs are the eyes and ears for the Defense Coordinating Officer in their State or Territory. How they are employed is up to the DCO (they can sit at the State EOC or to the NG JOC). This can very by each region. The Regional EPLO Team supports the DCO/DCE and can again vary based many factors. Most Regional teams manage the Mission Assignment process when it includes DOD resources. Definitely a unique job that does have the opportunity to help enter the EM community after your service.

These seem like positions that should be manned by a Civil Affairs Soldier.
Try the FEMA IS courses, or even their resident courses in MD to get an idea about emergency management. DSCA course on JKO have some insight as well.