good on ya! i too have the boost on order -- same vision as you, get into waves that are not barely not paddle able. And also maybe get up on foil winging in winds just slightly too low to pump into. Kinda have my doubts it'll work, but we'll see.
I sent the boost guys my idea and asked about modifications, but they were completely uninterested. A little surprising, as it seems a valid potential use that could spread their market. And to be honest, one that's a lot less kooky than adding a jet on a surfboard, so it could add a little more cool factor perhaps. I intend to cut off fin tip as close to motor as I can, to minimize catching potential....but they wouldn't give me any input on how far down I can go.
You may want to check out this thread/forum:
foil.zone/t/boost-surfing-fin-greatly-inspired-by-efoil/6561/19That forum is mostly efoil DIY'rs, a few weighed in with ideas for custom designed versions of what we're proposing with boost.
Finally: I have had no interest in efoiling. Price tag is ridiculous and I hear they are heavy and too much drag to actually surf. However, now starting to see videos of some riders playing in waves and have to say, it looks pretty fun. No way I am spending $10k+ on a toy and if I was I'd buy a jetski. But did get my reptile brain reacting. :-)