’My advise would be consider the P10 or even the Naia,"
If the OP likes the Rega philosophy of "just play records", P10 is reasonable. New Naia at double the cost, relative to the rest of the system-not so much.
Naia does look interesting, is it now available? MSRP for what you’re getting seems high? Probably will sell though.
"I may look at a Herbies mat again, but the last time I tried a record weight on the Rega, it was not an improvement (on this particular table.)"
Any additional aftermarket doo dads defeats Rega design. Spend that dough on good records. Isolation base good move.