Welcome to AC!

Personally, I would stick to just putting the Miflex on the tweeter circuit, with a sonicap bypass on the woofer circuit, but if you wanted to use a miflex cap on the woofer circuit as well, I would also replace the Erse cap with a sonicap.
The miflex bypass caps will give the sonicaps a warmer, more laid-back tone without sacrificing any clarity.
Thought they can sound a bit "hard" at first, and will take a good 400-500 hours to finally relax and sound their best.
Sonicaps need about 200hrs.
Miflex bypass caps are $24 each and the sonicap Gen 3 bypass are about $8 each. Id have to get you a price for the capacitor in the woofer circuit.
Though to my knowledge, not many have done what you are considering, i know someone who is currently upgrading their Klipsch RP504C with Miflex caps in the tweeter and Mids, as well as swapping to Dayton copper resistors over the Lynks resistors we currently use.
But you're more than welcome to take them as far as you'd like
