Would agree that a new reserve league & championship format should be trialled. I'm not sure an east/west split on its own would be enough though as in the west some significant travelling could still happen, e.g. Clann na nGael or Owen Roes away to Fintona or Trillick, for example. You'd also need to tighten up the lists of 12 that are submitted.
Just as an example for a potential format (rip it apart if you want!)
League - All-County "main" reserve league, 20 teams, two divisions of 10 teams each, double round-robin (18 games). Bottom two in Div 1 relegated to Div 2, top two in Div 2 promoted. Bottom two teams in Div 2 relegated to "local" tier, third from bottom into promotion/relegation play-off. "Local" tier below all-county division 2 reserve league; split the county into either two or three districts. e.g. for two districts, east & west, have hopefully in the region of 14-16 teams competing in each district. Each district split into two divisions of 7-8 teams each. To expand, West Tyrone Reserve Football League divisions 1 & 2 - team finishing top of WTRFL Div 1 is promoted to ACRFL Div 2. Team finishing second in WTRFL Div 1 plays off against second in ETRFL Div 1, winner then plays 8th in ACRFL Div 2 in promotion/relegation play-off. Bottom team in WTRFL Div 1 is relegated to WTRFL Div 2, replaced by WTRFL Div 2 winners. Runners-up in WTRFL Div 2 play against second from bottom in WTRFL Div 1 in promotion/relegation play-off. Same idea for promotion & relegation of teams in an East Tyrone RFL.
Championship - All teams playing in that years ACRFL play in the Tyrone Reserve "A" championship. Preliminary round involving the eight lowest finishing teams in the reserve league in the previous year before first round proper. Reserve "B" Championship competed for by west & east Tyrone Div 1 teams, Reserve "C" championship by west & east Tyrone Div 2 teams.
Second reserve (or "third") teams - a club that either has a reserve team in the ACRFL or in division 1 of a district league would be allowed to field a third string. This third team would not be allowed to play in the all-county reserve league, nor be promoted into Div 1 of their district league if their second string is to play in West/East Div 1 the next season - promotion or play-off rights would be granted to the team finishing below them.
Current rule that allows ACL reserve Div 2 and Div 3 league games to be played 13-a-side if at least one team cannot field 15 players to remain in place for West & East reserve leagues. All championship games plus promotion/relegation play-offs remain 15-a-side.
Games where practical played on Friday evenings with a 7.00 to 7.30pm throw-in, dependent on daylight. Start from early April with an aim to finish the leagues, excluding play-offs, no later than mid-September. No postponements for any club that has a player in a county panel from minor and above during the league.