Can you use a UV/IR cut as an ERF for the Baader Sundancer II?

[LukeTheNuke]

Can a UV/IR cut filter be used as an internal ERF (instead of an external D-ERF) for the Baader Sundancer II h-alpha solar filter with a 120 mm scope?

I don't want to go the (expensive) external D-ERF route, as I like using a h-alpha filter in different refractors (60, 85, 100 and 120 mm, and who knows what else in the future). They say up to 80 mm no ERF is required, same as the Quark, as far as I recall. And I believe both are mica-spaced etalons.

I know you can use a UV/IR cut with the Quark in a 120 mm (hence why I ask for the Sundancer), but I'd like to avoid going Quark again, due to multiple issues I've had with them, unfortunately, as lovely as a good Quark is. The latest being that my wife's Quark hasn't aged well.

One plus for me of the (much more expensive) Baader Sundancer, I understand, is that it uses a Solar Spectrum filter (which has a good reputation as far as I know), and should hopefully be non-ageing, though you still need to avoid it freezing ("The dielectric coating of the block filter (instead of the usual silver coating) and airtight storage of the SolarSpectrum Etalon filter in oil prevent the ageing processes of simpler filter designs. With proper treatment, the SunDancer II will retain its performance for many years.").

Thanks for any help with this.

Luke

Edited May 11 by LukeTheNuke