The only problem that I could see arising from having both a 695nm filter and a 720nm filter available is the likelihood that you will end up with at least two shots of everything, and use twice as much film.
There is always a healthy dose of educated guessing involved with IR sensitive film - because we really have no good ways of measuring how much IR is mixed in with the visible light we can see.
We can also do a lot at the presentation stage.
From a presentation I put together a few years ago, using Ilford SFX as an example:

There is always a healthy dose of educated guessing involved with IR sensitive film - because we really have no good ways of measuring how much IR is mixed in with the visible light we can see.
We can also do a lot at the presentation stage.
From a presentation I put together a few years ago, using Ilford SFX as an example: