I think it might be possible, but you can't do it on the keyboard itself-- you'd need to hack the registrations in your BUP or USR files using a hex editor. I don't recommend doing that unless you're familiar with hex data and hex editors-- as well as the structure of your BUP or USR files-- and positively know what you're doing.
The PSR-S, Tyros, and certain older PSR models did have a "freeze" function, but the PSR-E models don't have that. However, if a given data field within a saved registration contains invalid data-- generally a hex value of FF, but in some cases 7F-- then the keyboard will ignore that data field when the registration is recalled, such that the current setting of that item will be left untouched. This is a bit different than the freeze function, but it lets you achieve similar results.
I can't promise anything for sure, but If you email one of your BUP or USR files to (e-mail address removed) so I can examine it, I may be able to write a simple Windows utility to let you freeze the voices in a registration, as well as add a second split point to your keyboard.
(It turns out that the registrations for the PSR-E models-- at least, those I've seen-- contain two different data fields for the split point. The keyboard sets both fields to the same value when you save a registration, but they actually control two separate split points, similar to the way that PSR-S and certain older PSR models have two separate split points for the auto accompaniment and split voice. If you set the accompaniment split point to a lower value than the split voice split point, you can split your keyboard into three sections-- accompaniment on the left, split voice in the middle, and main and dual voices on the right. Normally you can't play with the split voice if the accompaniment is turned on, and the PSR-E models don't have functions for setting the two split points separately, so the only way to achieve this is by hacking a registration.)
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