trouble removing valve cores from tpms

[FellowsheepTech]

So, last fall I picked up a set of staggered 20" M-sport wheels with new directional tires on them from CL to replace my stock 18" tires/wheels. The "new" wheels don't have TPMS sensors in them, so my plan was to swap from stock wheels or recode to FTM.

After three install attempts I never got my cable/laptop working with INPA/etc. & have been using a Schwabben/510 for most tasks.

Now it's time to "rotate" fronts (remount in this case) & I figured step one to swap sensors was deflate the old tires prior to dismounting. Trouble is I can't get the valve cores out. Is there a trick to it? I now see that TPMS valve service kits at a minimum are recommended & I wouldn't have an qualms with buying new valves if need be, but not investing in new sensors.

Also, any experience using balancing beads in the M-sport/M sized tires/wheels? A friend uses them consistently w/good results in Harleys and his truck, but these are kinda low profile & I'm cynical.

Same friend has tire mounting and balancing equipment, so strictly DIY

TIA...