Maybe they should replace it with a seal. I realise 'tradition' is actually a very malleable thing but when a heavy bomber squadron converts to wearing navy uniform, I think you can argue tradition has been dispensed with.
The official division of Lightning manpower between the 2 services is roughly 60:40 RAF/RN but that will ebb and flow in specific areas. That division will or already does stand across 17, 617, 809 and 207 sqns.
All sqns will be capable of ops from land or sea and will have rotational sqn/XO posts. For instance, right now OC617 is RAF and his XO is RN but that will reverse on the next turn of the handle. Likewise, OC/XO 809 will probably be RN/RAF initially but will also rotate.