Font Size Issue with Instrument Numbers After Condensing

My client wants the instrument labels on the first page to be 10 pt and on the following pages 8 pt. Achieving that isn’t particularly difficult — I can simply assign a new style to the abbreviated instrument labels.

However, after condensing, Dorico uses the font size from the first page for the instrument numbers (I, II, III, etc.). To avoid it looking like this:

…I urgently need a workaround. Does anyone have an idea how to get around this problem?
Thanks a lot!