Hi to all!

I play Eb tuba, but am looking to learn the Bb euph as well to extend my repitoire. I (obviously) play Eb tuba music reading from bass clef, and also can read treble - I imagine that it's bass clef and add 3 flats to it.
I can also play euph music that's been transposed in the treble clef, by again imagining it's in bass clef.
The problem is when I read bass clef. I could learn the Bb euph fingerings all over again (it took me about 6 months to get my Eb fingering down pat), but I was wondering if you guys have any tips or tricks that I could try, to make it easier to play bass clef euph?

Thanks,
Alex.

Addition: Also, what about 'C' euphoniums? Would they have the same bass clef fingering as a Eb tuba, a BBb tuba or a C tuba? Thanks.