First of all as everyone stated you mode the right call, your mom would be proud that her child has an above room temp IQ. Humor set aside diving with an insta-buddy works well in shallower less challenging dives. I have dove those type of dived and have always taken a pony setup completely redundant. In the later years with a bit more experience I shelved the pony and got an old steel 50 as a replacement as I didn't want any unwanted surprises at depth and as mentioned I don't depend on an unknown as you never know how someone acts when the poop's in the fan. If you are going to be doing deeper jumps update your rig and start off with an instructor...... that you know or at least know of by positive recommendation. I've known a couple of instructors I wouldn't trust with your wife, if you know what I mean. And for the love of Pete, stay sharp and stay focused never stop thinking...... the life you save might be mine