Minor ii-V-i on 5 row stradella

[stickista]

Can anyone tell me how one can accomplish a minor 251 on a five row stradella?
To play C half diminished, F altered, B-flat minor, I can see that you pair the C root with an E flat minor. That doesn’t seem too difficult. ( or is it?) But the only way to build an altered cord of any sort on a dominant is to pair the root with the Tritone minor of its V. So to get an F altered 7, you need to pair an F bass with an F#minor which doesn’t seem doable.

I can’t believe that five row players simply don’t have a way to play minor ii V i progressions.
What am I missing here?

The reason I’m frustrated is that Thierry Benetoux it’s about to build me an instrument, and I have probably switched back-and-forth between requesting 4 row free bass and 5 row Stradella half a dozen times because of this issue and I really need to make the right choice.

 

[losthobos]

Can you spell the F alt 7th for me....
Another way to play half dim7th on 5 row is
Play 7th plus bass note half step higher ...
So F7 plus F# bass equals F# half dim
C7 plus C# bass equals C# half dim
Etc
Generally I've seen guys use this method with the root bass note played on the counter ass row.....although I have seen some use the bass note on the fundamental row and then use their thumb to hit the 7th chord

 

[JeffJetton]

Can anyone tell me how one can accomplish a minor 251 on a five row stradella?
To play C half diminished, F altered, B-flat minor, I can see that you pair the C root with an E flat minor. That doesn’t seem too difficult. ( or is it?)

Yup. It's easy if you use the C root that's counter bass of Ab.

But the only way to build an altered cord of any sort on a dominant is to pair the root with the Tritone minor of its V. So to get an F altered 7, you need to pair an F bass with an F#minor which doesn’t seem doable.

Plus you're missing the 7th, which isn't ideal either.

You could try playing the counter bass of Db to get your F root, then pair it with Cb7. Assuming your accordion voices that chord as Eb, Gb, A, that'll all effectively add up to an F7(b9), which works fine in a minor ii-V7 context.