I “think” you enjoy this… T61 (256 Gb SSD Debian 10, RAM 4 Gb) and E14 2021 (upgrade with RAM 16 Gb, 1 Tb M.2 for Windows 11 and 256 Gb SSD for Debian 11, all Crucial) : r/thinkpad
Lenovo Thinkpad T61 Tutorial how to Remove & Hard Drive-Upgrade Memory DDR2 667 MHz - YouTube
Lenovo ノートパソコンT61 分解・クリーニング - イマジネットパソコン救助隊ブログ
8GB 2X4GB Compatible Memory for Lenovo Thinkpad T61 T61p DDR2 PC2-5300 SODIMM RAM (PARTS-QUICK Brand) at Amazon.com