Welcome to the Pentax Forums and I hope your disability is something you can eventually recover from.
The K-70 is a wonderful value camera, offering improved low light and overall imaging capability. It is more compact than your K10D, but is very well built for its class of camera, including featuring weather sealing (WR) like your K10D, and has the swing-out LCD screen. I have a K-S2, which has a similar design. The lenses you have been using with your K10D will work fine with current Pentax APS-C models, but it appears none are of WR design. It is necessary to have a WR lens mounted on a body having WR to have an ensemble that is WR capable. A new lens of higher standard which also includes WR could provide this advantage as well as being capable of delivering the improved imaging capabilities of these latest camera models.
The KP is also compact, about the same weight as the K-70, but is closer to the pro-style on-body control set of your K10D, with less need to go into menus to make changes. Its pull-out LCD screen is not good for selfies, or for corner angles, but is still convenient and takes up less lateral room when employed. It is good for downward or upward-angled live-view shots. It has primarily metal body construction, an advanced SR system, as well as metering and AF systems. It also offers exceptional low-light higher ISO low noise performance. Like the K-70, its small, lightweight battery does not have capacity comparable to that of your 10D, so it is advisable to purchase a spare to carry along in case you run low on battery reserve. With the KP, however, there is an optional battery grip available which accepts either a second small battery or for yet greater battery backup, can take the same substantial battery used in your K10D. It features duplicate controls for vertical shooting. It is priced well for a camera body of this class of build and feature set.
Last edited by mikesbike; 03-09-2018 at 08:17 PM.