well, time moves on and after shenzen referred my issue to topping i have been waiting for godot, but no longer !
unable to resist a bargain, and brave enough to trust a different chinese provider (or maybe just the same using a different brand name), i ordered this device, which has no bling at all, but replaces the defective component with an even more current iteration of bluetooth
really, for ~$36aud i am okay to try; it cost me only $3 less to confirm the local tech couldn't repair the e70, so for total expenditure $69 i will have "fixed" it, albeit will need to push one more button to fire up the music, and the dac component of the e70 is still great for my purposes (and i get to retain the 12v trigger off it so i can ignore the nad d3020 controller, which may be the worst remote i have ever had the misfortune to wave at the home theatre, although the accuracy and finesse of the air mouse i use there makes me look like i have a significant neurological deficit)
so, this baby :
Specifications:
▶ Audio Input: Bluetooth 5.4
▶ Audio Output: Coaxial/Optical
▶ Bluetooth Name: AkLIAM DD2 BT5.4
▶ Bluetooth Chip: Qualcomm QCC3084,support: SBC/AAC/APTX/APTX-Lossless/APTX-HD/LC3/APTX-Adaptive/LDAC(96KHz/24Bit), ,
▶ Power Supply: USB C,DC 5V
▶ Working Current: 13mA
▶ Size: 75*90*23mm
▶ Color: Black

fingers crossed it loves me long time