Yep, the positioning is very awkward. The biggest thing is, due to the way the PM3 command line works, you have to be able to at the very least hit the Enter key while either holding the entire PM3 easy on top of your implant, or if your placement allows for it, holding your hand super still on top of the PM3. If you have a second person who is willing to follow good instructions, that would help a lot.
You can’t use the ProxLF on the Easy, no. It’s a bit complicated, but on the RDV4 the tuning capacitors for the antenna are on the antenna module, rather than the mainboard. There’s been talk of modifying the Easy’s tuning caps to match it to the antenna, but AFAIK it hasn’t been done, and it definitely isn’t for the inexperienced. However, you can make a DIY version of the ProxLF that will work for the Easy (you’ll need a decent amount of supplies, though). There’s an excellent topic here:
It’s not for the faint of heart, but it’s also not incredibly bad. I plan on making one in the next few months (when my university goes on break). You could always pick up an Easy to mess around with, and then when you feel up to it, try and make the antenna further down the line.