Back in the early days of webcam planetary (and DSO) imaging. (~15 years ago) I wrote a little IR FAQ based on my experiences and those of others on the QCUIAG yahoo group.
http://www.threehillsobservatory.co.uk/astro/IR_FAQ.htm
The results achieved these days far surpass what I was getting back then though and I am out of touch with current thinking. The basic reasoning there should still be sound.
Of particular interest may be the test mentioned there I I made on Saturn with and without IR block which showed lower noise if IR was included, no loss of resolution and that it was possible to correct the colour caste caused by the IR leaking past the RGB filters.
The colour camera will almost certainly already have an IR blocking filter so you would need to find out how to remove it to test this out
Cheers
Robin