First of all, I would agree with others that have said just build a full HPR. Really, who cares if you only fly it rarely. And why not use a full-on DD capable for cert? You dont have to launch as DD. (Need some slight reconfiguring though)
Anyway, you mentioned the IQSY. (lots of Mfctrs make that) but IMO the LOC IQSY Tomohawk is a great choice. Its a nice flyer.
However, that said, if you still really want to go with a primarilly MPR that
will fly HPR, have a look at AeroTech. The Arreux for example,*will definately* get up there on an H, (3~4k) (The Arreuax on an H has been desribed as "A needle in the sky". ) but you could fly all day on E,F,& G's (Until your E CATOs that is!
)
That said, I have never flown E, F, or G motors, but I know the Aerotech kits are for those, so I don't have any idea how anything I have/have experiance with would fly on the lower impulse stuff (I do A~D and H+)
It is not a large rocket, however it is fairly rugged, using Plastic FinLoc fins and utilises a Baffle system (which so far seems to actually work well after several flights on H motors)
You can put an Altimeter in it depending on how you build it and in any case If you're going to fly it on an H, you *should* probably equip. it with a Tracker. Oh and just for visual tracking purposes, stick with AT's Yellow Paint scheme (or something really bright)
Anyway, my thoughts....
Whatever you choose, "Be Safe, Have fun!"