Duo 4K se has modular tuner may be you can purchase a non FBC VU+ tuner that support blindscan and plug it in (but check its compatibility first).
You can also have a look at external DVB-S2 USB tuner but then you should ensure that they are blindscan capable and that they are compatible with the Duo 4K se kernel version.
We should never assume anything when purchasing a STB, I have a VU+ Solo4K it has 2 cardreaders and 1 CI slot, I purchase later on the Duo 4K and was surprised to see that it has only one card reader. :-( (but 2 CI slots).
I purchase also other brand STB assuming that every dual tuners boxes are capable to perform Picture-In-Picture and stream but they are not.
Choosing the right STB is not an easy think, it is hard to find one that will fulfill all the requirements.
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Sat: Hotbird 13.0E, Astra 19.2E, Eutelsat5A 5.0W
VU+ Solo 4K: 2*DVB-S2 + 2*DVB-C/T/T2 (used in DVB-C) & Duo 4K: 2*DVB-S2X + DVB-C (FBC)
AB-Com: PULSe 4K 1*DVB-S2X (+ DVB-C/T/T2)
Edision OS Mio 4K: 1*DVB-S2X + 1*DVB-C/T/T2