You're probably better off getting one of the TU58 emulators running with a SLU on your machine. There are lots of premade TU58 tape images for various XXDP diagnostics sets, RT-11, etc. Especially if your RX01s are not known to definitely be working. Nowadays I usually use AK6DN's tu58em
I/We are happy to help you get TU58 emulation up and going
I can probably write out RX01s for you -- I've got working RX02 drives on my MINC-23 -- I'm just concerned that you may not get anywhere due to some other system fault.
Been around this block before, see: http://www.vcfed.org/forum/showthread.php?63987-Need-help-with-11-23-system/page2
My suspicion is there is something more fundamentally wrong with his system than just the DLV11 interface which does not allow TU58EM emulation to run.