yes you can. use LGMDP v1.5 to do it. I will assume you have drivers loaded so LGMDP can recognize your device.
depending on how your SD card is setup, you may need to include partition.mbn in the folder where your recovery.img is. that was my case. would not install correctly otherwise.
I must be mistaken, but I thought once you successfully boot into CWM that you can use the power button to enter/execute a menu item.
if you search/google "install recovery LGMDP" there are several versions of instructions around. if you get lost post back
Can I install this version of TWRP on the T-Mobile Optimus T (P509)? And is there another way to install TWRP? My menu button doesn't work so I can't flash a zip file in Clockworkmod.