Cable card + Own router question

Hi, 

I have been using a Cable Card to get FiOS Select HD via HDHomeRun Prime on my Windows HTPC. I have also been using MI424WR for 50/50 FiOS internet. 

The cabling is as follows:-

From ONT -> Coax cable to splitter ->(1) to HDHomeRun Prime with Cable Card (from here an ethernet cable to router).

                                                         -> (2) to MI424WR for Internet access (router)

I am wondering if I can completely replace the MI424WR with a different router and have an ethernet cable from the ONT into the WAN port of the new Router? The TV etc should not be affected since I don't have VOD and FiOS Guide Data in the first place (it is all provided by Microsoft). 

Would this work? Does anyone have htis working?