Thank you for your replies, it's appreciated.
While there may be better options with a bit more time to spare, this is partly a matter of expediency and the fact that I can (indeed, will) have the SMPS in my hands tomorrow.
I can use batteries with these lights, but (i) they eat batteries to the point that a mains PSU works out cheaper quite quickly, and (ii) we've been caught out in the past with the light levels gradually dropping as the batteries get eaten, because someone forgot to check the levels (
) and it was too subtle to notice until it was too late to fix it (
). Generally they are being used somewhere with mains power, but I'll be keeping the supplied batteries charged and a few blocks of AA handy as well, as these lights can use either with an adapter.
After a bit of additional digging around, it seems that the amount of noise from the SMPS is unlikely to translate into detectable or recordable flicker. I'll find out tomorrow evening, hopefully, as I should be doing a test run providing I don't blow the test light up
The custom control panel is looking nice though. Priorities, etc