I would just advise not to make it too difficult or to have unreasonable expectations. You have to keep in mind that you'll never know the perfect portfolio allocation until after the fact.
Here is a list of assets that offer some inflation protection in no particular order:
Precious Metals
REIT's
Natural Resource Stocks
Swiss Franc (historically, but this may have changed with the peg to the Euro)
TIP's
Commodities
Fine Art
Investment Grade Diamonds
You have to keep in mind that these will perform well relatively to inflation, but will not have a perfect correlation by any means.
Look at the white paper that I linked above. Gold is actually not always a great inflation hedge, but IMO it is crucial to hold some because in hyper-inflation it will save your skin. Also, in negative real interest rate environments it does very well.
I guess where I'm going with this is that not all inflation is equal. You have hyper inflation, severe inflation, moderate, low, etc. It also makes a difference if inflation is rising or falling. Supply and demand factors also impact these assets and their correlation to inflation, especially in the commodity and metals.
TIP's, metals and REIT's are highly sensitive to interest rates as well.
A way to make it very easy, IMO would be just to hold PRPFX in your VP (or duplicate it with your own ETF's). PRPFX is not the same as the PP, and is more tilted towards inflation. If that doesn't offer enough protection to your liking, you could do something like 50% PRPFX and 50% in a commodity mutual fund (or substitute an energy linked fund like VGNEX).
You know you have a defined benefit each month, so I agree with your thinking that it's wise to add some additional inflation protection.
By the way, I would recommend reading the paper that I linked, even though you aren't interested in REIT's. It provides inflation correlation for TIP's, commodities, gold and stocks as well. I'm sure there are a large amount of free research papers on inflation protection that you might look into online in order to ease your mind. It's hard to make investment decisions based on some anonymous/random internet poster such as myself.
