Seeking advice for a mini 3-way speaker (Woofers!!)

Hello,

I acquired a pair BlieSMa M74S-6 for a great price. The seller was upgrading their MUM-8 to the beryllium version of the dome midrange. I got very lucky!!
Let's pair the M74S-6 with the T25S-6 and plan on a passive crossover design to start. I don't want to go active quite yet.

What I would love help with is finding a 5" (or possibly a 6" or even dual 4") driver to build a compact 3-way?
From HiFiCompass' study of the M74 product line, I am assuming the high-pass will have to be near 500Hz.
I would like to keep the enclosure for the driver under 0.35 cu. ft. (10 liters).
Not sure I can ask for much in the way of sensitivity here. Getting close to 90db 2.83v/1m would be the dream.
Shooting for an F3 in the mid 60Hz range and F6 in the 50Hz range, if possible.
I am down to mounting the BlieSMa drivers on a flat panel akin to the LX521.4 or building them into an enclosure like the Barefoot Sound Footprint 01 where the woofers are locating on the side of the cabinet.


Here are a couple of options I have found.
Anarchy-554
SB Acoustics SB15NRX2C30-4

Currently, the mini 2-ways I am using contain a T25A-6 along with a Purifi PTT4.0X04-NAC-03 and utilizing a 6" Purifi PR. Loving these speakers!
They are flanked by a small subwoofer.

Fun thoughts on this one?!

 
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Consider Silver Flute W17RC3804 91.5db
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I was not aware of the Silver Flute W17RC3804. I am leaning towards that driver now. Thank you!!

I had considered the Dayton Epique drivers. The 7", with a 10" passive radiator, makes up the small subwoofer I mentioned in the original post.
I did not like the efficiency of the driver which is why i took it off the potential list.