Need audio transformer for RS Highball 2 mic

[fwrunner2017]

Hi;
I have a pair of RS Highball 2 mics, which do not have the internal transformer to convert to hi-z. They are 600 ohms fixed.
I want to use the mic with my Behringer UMC202HD which needs 3K ohms input for line or high-z for instruments.
I can use the mic as is, but need to turn the preamp gain on the UMC202HD all the way up to get any decent audio. I tried an 1/4" to XLR transformer, but that only made it worse.
I found a nice little transformer; Audio-technica CP-8201 which is 250 ohms in to 50K ohms out.
So my thought is that the CP-8201 would work, but not optimally. I would then switch the UMC202HD to instrument (Hi-z) instead of line to get a better match.

Any advice?

Thanks
FW

 

[Microkit]

Highball 2s are high impedance, they're the ones with an on/off switch and attached cable. Also, you can just get better microphones. I have a Highball 2, and I also have $15-20 mics that are better.