Using Sox to parametrically equalizing I'm losing seek functionality. Could it work?

I've recently bought a DAC (Topping D10) to connect to my headphone amplifier. I'm using Beyerdynamic DT 880 and I'm quite pleased with AutoEQ values for them.

Now, I used to use EqualizerAPO but that doesn't work with ASIO/WASAPI and... being stupid that way I like the display on the DAC to show the correct sample rate for the file I'm playing.

As such I've searched on the forums and found suggestions to use Sox to parametrically equalize.

I'm using the following in my custom-convert.conf:

#Headphones
flc flc * bc:5f:f4:bf:3e:70
# FT:{START=--skip=%t}U:{END=--until=%v}
[flac] -dcs $START$ $END$ -- $FILE$ | [sox] -q -t wav - -t flac -C 0 -b 24 - gain -6.9 equalizer 30 0.43q +6.2

mp3 flc * bc:5f:f4:bf:3e:70
# FT:{START=--skip=%t}U:{END=--until=%v}
[lame] --mp3input --decode --silent $FILE$ - | [sox] -q -t wav - -t flac -C 0 -b 24 - gain -6.9 equalizer 30 0.43q +6.2

I cut the rest of the equalization points to avoid unnecessary length for reading. Equalization works great. But with these lines I'm loosing the ability to seek to a specific point in a track (using Squeezelite-X to control music on my desktop PC).

Is this something that could be solved somehow?
Thanks in advance.