Why not fit a small tuning condenser and a coil in a tin box and null the offending signal…
You can basically use the receiver as a spectrum analyser to get the best L/C ratio
Thanks for the replies to my questions. They seem to support my gut feel to go with the SDRPlay.
Leif mentioned adding a notch filter for the offending AM station (1310kHz) has anyone built one of these filters and would care to share the details, or would it be easier to go with the PAR HPF (NOT LPF as I put in the original post!).