That timing is marginal at best. We figure 90 minutes from airport gate to resort and 90 minutes from resort to restaurant as typical travel times using Disney transport. The HDDR transport may require a bit more time since you need to go from POP to Fort Wilderness and then take the internal bus at Fort Wilderness to get to the HDDR venue. With 3 hours between scheduled arrival and ADR, you would be pushing the limit. I myself would not risk it.