any suggestions on what to replace Bluesound Node 2i with

Yes I would look at the Cambridge streamer before dropping $4500 on one. 

The alternative to the Lumin T2 with the same quality build and sound quality would be the Auralic Altair G1.  Both are vastly superior to the D series which I have own ed and both use ESS chipsets. Both are very favorably reviewed by reviewers and owners alike. Will likely come down to your preference for looks or software design though the Auralic is about $1500 cheaper. There are several dealers that carry both and if you search them out you can talk to them about both units. 

The ifi device is very interesting. 

Initially, I had a Sonos connected to to my Anthem MRX 1120 and replaced it with Node 2I.  I also have a separate 2.1 system with a Yamaha AS 2100.  Early this year, I replaced Node 2I with a Roon nucleus along with a Farad Super 3 LPS.  This is my preferred setup as I have Nucleus connected via USB to a Denafrips Pontus DAC. I stream both Tidal and Qobuz and can control via Ipad, PC or mobile device.  Auralic G1, Lumin, Innuos and NAD C658 are great choices to consider, but having a good DAC and/or streamer with quality LPS is key to great sound from Tidal and Qobuz!

Without question the class A rated Melco N-10
itis excellent on every level just as a streamer.