Capture the flag block

It would be nice if some sort of capture the flag block system existed.  

Here is how I see it.  In pve survival there would be some boss that to initiate you had to pick a banner up from an anchor block(s), and move it to a receiver block(s).  One locked in it would spawn the boss.  When a player carried the banner it would appear as it does on pillagers.  It would also give a rebuff.  Slower speed, increased aggro, etc.  A player dying with the banner results in it respawning on the anchor the anchor. Trying to pick up a banner from the receiver block also returns it the anchor.  If the donor/receiver pair are outside of the active radius of each other, then the banner cannot be placed, picked up, leaving the active radius with the banner returns it to anchor.

These anchor/receiver blocks would able to be mined and require some "calibration".   Then the player would place the receiver block, tap it with a banner to link it or 'charge' it.  A charged banner could then be placed on an anchor block and linked.  It would then emit light.  Debuffs would be tuneable, possibly by the block under the anchor block.  Placing the banner in the receiver would give a redstone pulse.  

I think something like this could make for some fun and interactive capture the flag builds.