Midway has some options in stock at present for 7rum.
It's all your decision here. The Sendero is a good rifle, but hanging another barrel on it will probably be north of 1K without much for other custom stuff. It all depends on how deep your toybox fund is, I guess.
The 28 nos and 7rum are very close; in fact my 7rum barrel was at 1 time a 28nos bbl.. By brother gave me a takeoff Brux (he went to 33nos) in 28. I had a bunch of brass and a set of dies in 7rum so I had my 'smith shorten the bbl. a bit to get a clean chamber and recut her to 7rum. My existing 7rum was shot out so I needed the barrel. This rifle's been a hammer on mule deer with 175 eld-x bullets.