$30K DAC in a $70K system - wise or ridiculous?

If you are considering a Lampizator DAC I recommend you start with the Golden Gate 2.  The GG2 is crazy good and the ability to tube roll enables you to dial it in to your musical preferences. As @audioman58 indicated earlier the Final Touch Audio USB cable has great synergy with Lampizator DACs.
While Lampizator does not offer a modular upgrade program, they do offer upgrades to keep your DAC current.  I had my original Golden Gate upgraded with new clocks and power supply changes when they came out and then later had it upgraded to a GG2.  Eventually I traded the GG2 in and purchased a Pacific. Absolutely no regrets as I’ve moved up the model line. 
I personally don’t believe you need to worry about a GG2 or a Pacific becoming a “boat anchor”. If you are in the US I think Lampizator still provides service in the country so you don’t have to ship it back to Poland for upgrades.

I would probably go for the Focal Scala Utopia Evo and sell the Kanta and then get a somewhat cheaper dac, like $12k.

1.) Sell your PS Audio BHK; (+~3500 in your pocket)
2.) Get an MSB Discrete DAC with USB module and extra power supply (~12K)
3.) Keep your Kanta 3;
4.) Enjoy


I owned a PS Audio BHK for a bit; Tube rolled, etc...ultimately did not last too long in my system;
I have the MSB Discrete dac that replaced a PS Audio DirectStream DAC. The MSB is incredible. Will be a great digital front end with the brighter Kanta tweeter;

With the Lampizator volume option you eliminate the need for your BHK pre-amp so I think it's a great upward move. Good luck! 

A few years back I made exactly this move. Put a $25k DAC (TotalDAC) in $60k system (Luxman & Vivid). Because the DAC was precisely to my taste and beat out several other $20-$30 DACs, it was the most unregrettable move I ever made. In fact it’s the only piece I still have from that setup and has survived 2 full overhauls. So my recommendation is that if the Lampi makes music exactly how you always imagined your system would sound, go for it. If you have any doubts it’s an endgame sound, it’s too expensive a mistake. A piece at that price is only justifiable if it’s an anchor to your system.