No, they are not too long. But longer heads will require more skill to cast, and will be an all round different experience. If you want to get an approximate idea, use the the line length to rod length ratio. So for example for a similar weight line corresponding to a 6wt single hand rod, let’s say a shortish 3 wt 12’ SPEY rod, a Rio Scandi short would have a ratio 29/12 = 2.4. And a skagit head on that short spey rod more like 20/12 = 1.7. And those would be about the typical ratios on a spey rod for the scandi and skagit “experience”.
The ratios of the two lines you mentioned are 22/9.5 and 28/9.5 so 2.3-2.9 and so from Scandi to longish Scandi ratio. So something to be aware of, depending on your tastes and experience. But if all you have used in the past is a skagit on a spey rod, or you want to huck mice or bigger flies, then I’d go for the commando. But there is no fundamental need to worry about head lengths. The examples above are just a rough way to get an idea what you would be getting into. My personal favorite SH spey line on my 5wt 9’ rod is the rio SH spey line, but that is a whole other thing as well, and at 33’ this would be a ratio of 3.7 so getting on short end of short belly equivalent.
Hope this helps a bit. If you will ever be stripping flies too, as I suppose might be the case for Bass, maybe consider an integrated line. Very nice if you ever need to strip the fly almost to the end. If you are going to be considering full price you could also consider giving line maker Steve Godshall a call - he can build a integrated commando length line, or anything you want, for the same price, plus he can discuss all the issues and tradeoffs beforehand better than anyone.
Just to mention, if price really IS a serious issue the you can easily MAKE a comando style skagit head out of a cheap $20 shootinghead you can buy on eBay. Most of these even come with a braided nylon loop to install on the end. And you can get 2 “comandos” out of one of these if you are lucky! This will require buying the right density, and cutting. I’ve done this several times with great results and it might be a nice way to go for experimenting with this stuff.