Do you only have one DP21 at the moment? If so, then you'll need another.
So you have a single 722k that you want 5 sats on? If so, here's how I would do it :-
1.) Run three feeds from your 1k.2 and 1 feed from your 118 to your DPP44 (119 port 1, 110 port 2, 129 port 3, 118 port 4.)
2.) Depending on the 61.5 LNB (which should be either a DP Single or a DP Dual) you will need to do one of two things: Either two feeds from the DP Dual ports, or a single feed w/splitter from the DP Single.
3.) Run 2 feeds from the bottom receiver ports 2 and 3 on your DPP44 (don't forget your power inserter on port 1) to two DP21s, both on the TO DISH 1 input.
4.) Take your two feeds from the 61.5, hook them to the TO DISH 2 input of both DP21s.
5.) Run feeds from the TO RECEIVER ports of each DP21 to the SAT1/SAT2 ports of the 722k.
6.) Run a check switch. Should be successful.
Oh, and yes, the HFS-2 should work fine for splitting your 61.5.