Thanks to everyone who chimed in up-thread with great info and wisdom pertaining to how best to get to Baoding from PEK.
I will have 1 22" roll-on-board plus the usual backpack. Indeed it is not fun to take the AEX plus metro from PEK to BJX, anytime day and night. A taxi would take about 90 minutes that time of day.
Good to know that there are 2 train ticket offices in PEK: 1 in T2 and the other in T3. I was not aware of either before. I will get my ticket to Boading and additional onward tickets at the airport. (I gave up the bus idea, if there are indeed no more frequency than 6 daily).
I do like traveling by train in China. Did it 3 times this year, including a recent trip that went from Shenyang to Urumqi.