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Glen,
what a quandary huh?
While not having exactly the same problem as you, I am finding a similar situation with the two Naglers I currently own, a 22mm (2" only) and 12mm (both 2" and 1.25").
What I usually do is use the 12mm with a 2" to 1.25" adaptor, as you would normally, and this adaptor has a 48mm filter thread on it's front.
So if I do any lunar viewing with a single eyepiece (as opposed to the binoviewer) and I use a filter it goes on the front of the adaptor. Mostly this is a result of using older 48mm camera filters in the colours I wanted, orange etc.
I think logically you are better buying the bigger (albeit more expensive) 2" filters now, rather than later. Just make sure you can use them with the 1.25" eyepieces, possibly with the style of adaptor I use.
Gary
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